Wyoming authorities warned Lone Tree police about bizarre implied threats more than six weeks before a gunman killed a Douglas County deputy and wounded four law enforcement officers, officials say. 
 
 University of Wyoming detectives called Lone Tree police and warned that Iraq war veteran Matthew Edward Riehl, 37, had made veiled threats against professors of the UW law school, where he earned a law degree, and that his vulgar, nonsensical rantings were indicative of a mental illness, said Chief Mike Samp of the University of Wyoming Police Department. 
 
 The warning to Lone Tree was made in mid-November, more than six weeks before Riehl shot and killed Douglas County Deputy Zackari Parrish. Samp said it’s possible that Colorado authorities faced the same conundrum Wyoming officials do when an apparently mentally ill and dangerous person makes veiled but not direct, imminent threats. 
 
 “Wyoming statutes are pretty clear: If someone is not making an immediate threat, they cannot by held for a mental evaluation. They are very tough cases,” Samp said. 
 
 Sunday morning, four deputies answered a domestic disturbance call to a Highlands Ranch apartment when Riehl allegedly fired more than 100 shots, killing Parrish and wounding three other deputies, a Castle Rock police officer and two neighbors. Riehl was gunned down in an exchange of gunfire with SWAT officers. The injured law enforcement officers were Mike Doyle, 28; Taylor Davis, 30; and Jeff Pelle, 32: and police officer Tom O’Donnell, 41. Two people in adjacent apartments were injured, but their names have not been released. 
 
 Provided by the Douglas County Sheriff's Office Douglas County Deputy and former Castle Rock Police Department Officer Zackari Parrish, fatally wounded on December 31, 2017 at the Copper Canyon Apartment complex in Highlands Ranch, Colorado. Four other officers and 3 civilians were wounded. 
 
 Photo provided by GoFundMe Douglas County Deputy and former Castle Rock Police Department Officer Zackari Parrish, fatally wounded on December 31, 2017 at the Copper Canyon Apartment complex in Highlands Ranch, Colorado with his family. Four other officers and 3 civilians were wounded. 
 
 Provided by the Douglas County Sheriff's Office Douglas County Sheriff’s Deputy Michael Doyle, 28, was wounded in the shooting. 
 
 Provided by the Douglas County Sheriff's Office Douglas County Sheriff’s Deputy Jeff Pelle, 32, was wounded in the shooting. 
 
 Provided by the Douglas County Sheriff's Office Douglas County Sheriff’s Deputy Taylor Davis, 30, was wounded in the shooting. 
 
 
 
 Provided by the Douglas County Sheriff's Office Castle Rock Police Department SWAT Officer Thomas O’Donnell, 41, was wounded in the shooting. 
 
 John Leyba, The Denver Post Police officers line up their patrol cars outside of Littleton Adventist Hospital for a procession honoring an officer who was fatally wounded in a domestic incident in a Highlands Ranch apartment complex on Sunday, Dec. 31, 2017. 
 
 John Leyba, The Denver Post Police officers line up their patrol cars outside of Littleton Adventist Hospital for a procession honoring an officer who was fatally wounded in a domestic incident in a Highlands Ranch apartment complex on Sunday, Dec. 31st 2017. Four other police officers and 2 civilians were wounded. 
 
 John Leyba, The Denver Post Police officers line up their patrol cars outside of Littleton Adventist Hospital for a procession honoring an officer who was fatally wounded in a domestic incident in a Highlands Ranch apartment complex on Sunday, Dec. 31st 2017. Four other police officers and 2 civilians were wounded. 
 
 John Leyba, The Denver Post A procession of police officers and a hearse make their way down the highway outside of Littleton Adventist Hospital honoring an officer who was fatally wounded in a domestic incident in a Highlands Ranch apartment complex on Sunday, Dec. 31, 2017. Four other police officers and 2 civilians were wounded. 
 
 
 
 John Leyba, The Denver Post Police officers line up their patrol cars outside of Littleton Adventist Hospital for a procession honoring an officer who was fatally wounded in a domestic incident in a Highlands Ranch apartment complex on Sunday, Dec. 31st 2017. Four other police officers and 2 civilians were wounded. 
 
 John Leyba, The Denver Post Emergency personal and police officers at Littleton Adventist Hospital following a domestic incident in a Highlands Ranch apartment complex on Sunday, Dec. 31st 2017 that fatally wounded one police officer and wounded four other officers and two civilians. 
 
 John Leyba, The Denver Post The scene from the parking lot of an area AMF Bowling Alley as multiple deputies are down in Douglas County on Sunday, December 31, 2017. 
 
 David Migoya, The Denver Post Police officers investigate the scene of an alleged ambush where one deputy was killed and four other wounded along with two civilians at the Copper Canyon Apartment complex in Highlands Ranch. 
 
 David Migoya, The Denver Post Police officers investigate the scene of an alleged ambush where one deputy was killed and four other wounded along with two civilians at the Copper Canyon Apartment complex in Highlands Ranch. 
 
 
 
 David Migoya, The Denver Post Police officers investigate the scene of an alleged ambush where one deputy was killed and four other wounded along with two civilians at the Copper Canyon Apartment complex in Highlands Ranch. 
 
 David Migoya, The Denver Post Police officers investigate the scene of an alleged ambush where one deputy was killed and four other wounded along with two civilians at the Copper Canyon Apartment complex in Highlands Ranch. 
 
 David Migoya, The Denver Post Police officers investigate the scene of an alleged ambush where one deputy was killed and four other wounded along with two civilians at the Copper Canyon Apartment complex in Highlands Ranch. 
 
 David Migoya, The Denver Post Police officers investigate the scene of an alleged ambush where one deputy was killed and four other wounded along with two civilians at the Copper Canyon Apartment complex in Highlands Ranch. 
 
 Joe Amon, The Denver Post A gunman killed one Douglas County deputy and wounded four others during an early morning ambush as they responded to a domestic disturbance call at a Highlands Ranch apartment complex. Dec. 31, 2017 in Denver. 
 
 
 
 Joe Amon, The Denver Post A gunman killed one Douglas County deputy and wounded four others during an early morning ambush as they responded to a domestic disturbance call at a Highlands Ranch apartment complex. Dec. 31, 2017 in Denver. 
 
 Helen H. Richardson, The Denver Post Police investigate the scene of an early morning shootout that led to the death of a Douglas County sheriff deputy on Dec. 31, 2017 in Highlands Ranch. Deputy Zackari Parrish, 29, was killed and four other deputies were wounded in what police described as an ambush when deputies responded to a domestic disturbance at Copper Canyon Apartment complex at 3401 E. County Line Road. The gunman used a rifle and fired at least 100 rounds at the deputies. The gunman was killed in the shootout with law enforcement officers. Parrish is survived by a wife and two children. He had been a deputy for only 7 months. The other injured officers are Dep. Mike Doyle, 28, Dep. Taylor Davis, 30 and Dep. Jeffrey Pelle, 32. Castle Rock police officer Tom O'Donnell, 41 was also injured. All are listed as stable at area hospitals. 
 
 Helen H. Richardson, The Denver Post Police investigate the scene of an early morning shootout that led to the death of a Douglas County sheriff deputy on Dec. 31, 2017 in Highlands Ranch. Deputy Zackari Parrish, 29, was killed and four other deputies were wounded in what police described as an ambush when deputies responded to a domestic disturbance at Copper Canyon Apartment complex at 3401 E. County Line Road. The gunman used a rifle and fired at least 100 rounds at the deputies. The gunman was killed in the shootout with law enforcement officers. Parrish is survived by a wife and two children. He had been a deputy for only 7 months. The other injured officers are Dep. Mike Doyle, 28, Dep. Taylor Davis, 30 and Dep. Jeffrey Pelle, 32. Castle Rock police officer Tom O'Donnell, 41 was also injured. All are listed as stable at area hospitals. 
 
 Helen H. Richardson, The Denver Post Police investigate the scene of an early morning shootout that led to the death of a Douglas County sheriff deputy on Dec. 31, 2017 in Highlands Ranch. Deputy Zackari Parrish, 29, was killed and four other deputies were wounded in what police described as an ambush when deputies responded to a domestic disturbance at Copper Canyon Apartment complex at 3401 E. County Line Road. The gunman used a rifle and fired at least 100 rounds at the deputies. The gunman was killed in the shootout with law enforcement officers. Parrish is survived by a wife and two children. He had been a deputy for only 7 months. The other injured officers are Dep. Mike Doyle, 28, Dep. Taylor Davis, 30 and Dep. Jeffrey Pelle, 32. Castle Rock police officer Tom O'Donnell, 41 was also injured. All are listed as stable at area hospitals. 
 
 Helen H. Richardson, The Denver Post Police investigate the scene of an early morning shootout that led to the death of a Douglas County sheriff deputy on Dec. 31, 2017 in Highlands Ranch. Deputy Zackari Parrish, 29, was killed and four other deputies were wounded in what police described as an ambush when deputies responded to a domestic disturbance at Copper Canyon Apartment complex at 3401 E. County Line Road. The gunman used a rifle and fired at least 100 rounds at the deputies. The gunman was killed in the shootout with law enforcement officers. Parrish is survived by a wife and two children. He had been a deputy for only 7 months. The other injured officers are Dep. Mike Doyle, 28, Dep. Taylor Davis, 30 and Dep. Jeffrey Pelle, 32. Castle Rock police officer Tom O'Donnell, 41 was also injured. All are listed as stable at area hospitals. 
 
 
 
 Helen H. Richardson, The Denver Post Police investigate the scene of an early morning shootout that led to the death of a Douglas County sheriff deputy on Dec. 31, 2017 in Highlands Ranch. Deputy Zackari Parrish, 29, was killed and four other deputies were wounded in what police described as an ambush when deputies responded to a domestic disturbance at Copper Canyon Apartment complex at 3401 E. County Line Road. The gunman used a rifle and fired at least 100 rounds at the deputies. The gunman was killed in the shootout with law enforcement officers. Parrish is survived by a wife and two children. He had been a deputy for only 7 months. The other injured officers are Dep. Mike Doyle, 28, Dep. Taylor Davis, 30 and Dep. Jeffrey Pelle, 32. Castle Rock police officer Tom O'Donnell, 41 was also injured. All are listed as stable at area hospitals. 
 
 Helen H. Richardson, The Denver Post Police investigate the scene of an early morning shootout that led to the death of a Douglas County sheriff deputy on Dec. 31, 2017 in Highlands Ranch. 
 
 Helen H. Richardson, The Denver Post Police investigate the scene of an early morning shootout that led to the death of a Douglas County sheriff deputy on Dec. 31, 2017 in Highlands Ranch. Deputy Zackari Parrish, 29, was killed and four other deputies were wounded in what police described as an ambush when deputies responded to a domestic disturbance at Copper Canyon Apartment complex at 3401 E. County Line Road. The gunman used a rifle and fired at least 100 rounds at the deputies. The gunman was killed in the shootout with law enforcement officers. Parrish is survived by a wife and two children. He had been a deputy for only 7 months. The other injured officers are Dep. Mike Doyle, 28, Dep. Taylor Davis, 30 and Dep. Jeffrey Pelle, 32. Castle Rock police officer Tom O'Donnell, 41 was also injured. All are listed as stable at area hospitals. 
 
 Helen H. Richardson, The Denver Post Police investigate the scene of an early morning shootout that led to the death of a Douglas County sheriff deputy on Dec. 31, 2017 in Highlands Ranch. Deputy Zackari Parrish, 29, was killed and four other deputies were wounded in what police described as an ambush when deputies responded to a domestic disturbance at Copper Canyon Apartment complex at 3401 E. County Line Road. The gunman used a rifle and fired at least 100 rounds at the deputies. The gunman was killed in the shootout with law enforcement officers. Parrish is survived by a wife and two children. He had been a deputy for only 7 months. The other injured officers are Dep. Mike Doyle, 28, Dep. Taylor Davis, 30 and Dep. Jeffrey Pelle, 32. Castle Rock police officer Tom O'Donnell, 41 was also injured. All are listed as stable at area hospitals. 
 
 Helen H. Richardson, The Denver Post Police investigate the scene of an early morning shootout that led to the death of a Douglas County sheriff deputy on Dec. 31, 2017 in Highlands Ranch. Deputy Zackari Parrish, 29, was killed and four other deputies were wounded in what police described as an ambush when deputies responded to a domestic disturbance at Copper Canyon Apartment complex at 3401 E. County Line Road. The gunman used a rifle and fired at least 100 rounds at the deputies. The gunman was killed in the shootout with law enforcement officers. Parrish is survived by a wife and two children. He had been a deputy for only 7 months. The other injured officers are Dep. Mike Doyle, 28, Dep. Taylor Davis, 30 and Dep. Jeffrey Pelle, 32. Castle Rock police officer Tom O'Donnell, 41 was also injured. All are listed as stable at area hospitals. 
 
 
 
 Helen H. Richardson, The Denver Post Police investigate the scene of an early morning shootout that led to the death of a Douglas County sheriff deputy on Dec. 31, 2017 in Highlands Ranch. 
 
 Helen H. Richardson, The Denver Post Police investigate the scene of an early morning shootout that led to the death of a Douglas County sheriff deputy on Dec. 31, 2017 in Highlands Ranch. Deputy Zackari Parrish, 29, was killed and four other deputies were wounded in what police described as an ambush when deputies responded to a domestic disturbance at Copper Canyon Apartment complex at 3401 E. County Line Road. 
 
 Helen H. Richardson, The Denver Post A tow truck driver secures the suspect's vehicle to his truck as police continue to investigate the scene of an early morning shootout that led to the death of a Douglas County sheriff deputy on Dec. 31, 2017 in Highlands Ranch. Deputy Zackari Parrish, 29, was killed and four other deputies were wounded in what police described as an ambush when deputies responded to a domestic disturbance at Copper Canyon Apartment complex at 3401 E. County Line Road. 
 
 Helen H. Richardson, The Denver Post A tow truck driver secures the suspect's vehicle to his truck as police continue to investigate the scene of an early morning shootout that led to the death of a Douglas County sheriff deputy on Dec. 31, 2017 in Highlands Ranch. Deputy Zackari Parrish, 29, was killed and four other deputies were wounded in what police described as an ambush when deputies responded to a domestic disturbance at Copper Canyon Apartment complex at 3401 E. County Line Road. The gunman used a rifle and fired at least 100 rounds at the deputies. The gunman was killed in the shootout with law enforcement officers. Parrish is survived by a wife and two children. He had been a deputy for only 7 months. The other injured officers are Dep. Mike Doyle, 28, Dep. Taylor Davis, 30 and Dep. Jeffrey Pelle, 32. Castle Rock police officer Tom O'Donnell, 41 was also injured. All are listed as stable at area hospitals. 
 
 Helen H. Richardson, The Denver Post Police investigate the scene of an early morning shootout that led to the death of a Douglas County sheriff deputy on Dec. 31, 2017 in Highlands Ranch. 
 
 
 
 Helen H. Richardson, The Denver Post Sheriff deputies put up police tape around the scene of an early morning shootout that led to the death of a Douglas County sheriff deputy on Dec. 31, 2017 in Highlands Ranch. Deputy Zackari Parrish, 29, was killed and four other deputies were wounded in what police described as an ambush when deputies responded to a domestic disturbance at Copper Canyon Apartment complex at 3401 E. County Line Road. The gunman used a rifle and fired at least 100 rounds at the deputies. The gunman was killed in the shootout with law enforcement officers. Parrish is survived by a wife and two children. He had been a deputy for only 7 months. The other injured officers are Dep. Mike Doyle, 28, Dep. Taylor Davis, 30 and Dep. Jeffrey Pelle, 32. Castle Rock police officer Tom O'Donnell, 41 was also injured. All are listed as stable at area hospitals. 
 
 Helen H. Richardson, The Denver Post Sheriff deputies put up police tape around the scene of an early morning shootout that led to the death of a Douglas County sheriff deputy on Dec. 31, 2017 in Highlands Ranch. 
 
 Helen H. Richardson, The Denver Post Sheriff deputies put up police tape around the scene of an early morning shootout that led to the death of a Douglas County sheriff deputy on Dec. 31, 2017 in Highlands Ranch. Deputy Zackari Parrish, 29, was killed and four other deputies were wounded in what police described as an ambush when deputies responded to a domestic disturbance at Copper Canyon Apartment complex at 3401 E. County Line Road. The gunman used a rifle and fired at least 100 rounds at the deputies. The gunman was killed in the shootout with law enforcement officers. Parrish is survived by a wife and two children. He had been a deputy for only 7 months. The other injured officers are Dep. Mike Doyle, 28, Dep. Taylor Davis, 30 and Dep. Jeffrey Pelle, 32. Castle Rock police officer Tom O'Donnell, 41 was also injured. All are listed as stable at area hospitals. 
 
 Law professors at the University of Wyoming first contacted police about veiled threats Oct. 30, Samp said. 
 
 Riehl, using the pseudonym Matt Gonzo, posted the threats on websites he created including “University of Wyoming College of Law Veterans,” according to Chad Baldwin, university spokesman. 
 
 “It certainly did catch our attention. Anyone who read those posts can be left with an opinion that they were threatening. They were certainly alarming and bizarre,” Baldwin said. “We opened an investigation.” 
 
 Riehl also sent veiled threats in emails to the former dean of the law school and several other professors, Samp said. In one posting, Riehl included a picture of him holding an AR-15. Also concerning was Riehl’s military background, Samp said. He had served in Iraq. A spokeswoman with the National Guard confirmed to Denver7 that Riehl entered the Army Reserves in 2003 and served in the Wyoming National Guard starting in 2006. The spokeswoman said Riehl was deployed to Iraq in 2009 and was honorably discharged in 2012. 
 
 At one point, Riehl posted a screenshot of a Google map location of the shooting at the First Baptist Church in Sutherland Springs, Texas, in early November in which Devin Patrick Kelley, 26, shot and killed 26 people, Samp said. The picture was followed up by a posting of a statue of Socrates outside the UW law school. 
 
 Samp posted a uniformed police officer at the law school every day for the next two weeks, he said. 
 
 Wyoming associate professor Jason Robison, who was teaching two environmental law classes at the time, recalled how frightening it was when law school officials announced at a faculty meeting that several professors had been getting threats from an alumnus who recently had surrendered his Wyoming law license. Faculty leaders warned that police were taking it seriously. They explained that was the reason there were police and squad cars at the law building. 
 
 “They were acting with an abundance of caution. It’s totally unnerving to have to worry about these kind of threats in a university law school environment where highly politicized issues are discussed,” Robison said. “This is definitely a subject I brought up with my students.” 
 
 Riehl’s e-mails to professors were accusatory and had no basis in fact. The professors replied to him in a professional manner, suggesting he seek out mental health care, Samp said. 
 
 “These messages were highly indicative of someone with major mental health problems. It was definitely on the dark side of the spectrum,” he said. “Everybody knew Mr. Riehl could use some help.” 
 
 Samp said he asked the professors to stop replying to Riehl’s emails. 
 
 “We did not want to escalate his reactions to them,” he said. 
 
 The police surveillance of the law school in Laramie was discontinued in mid-November when detectives finally tracked Riehl’s whereabouts to an apartment in Douglas County. A detective called and spoke with an officer at the Lone Tree police department, Samp said. 
 
 Baldwin said Riehl made only obscure threats. 
 
 “Our police department did not get an overt threat to act upon,” he said. 
 
 Samp said they were hoping that Colorado laws might be more flexible, possibly allowing officers to have Riehl committed to a hospital for a psychiatric evaluation. 
 
 Riehl also began posting videos on YouTube in November expressing anger at Lone Tree Police Department officers, particularly one officer who appeared to have pulled him over in a traffic stop. 
 
 The week before Christmas, Riehl posted a video of himself wearing an Iraqi Freedom Veteran cap where he announced he was running as a libertarian for Douglas County sheriff. He then went on a rambling rant about a specific deputy he accused of being a pimp, and he called Sheriff Tony Spurlock a clown. He did not threaten violence. 
 
 In a news conference Sunday, Spurlock said deputies had prior contacts with Riehl, who did not appear to have a criminal record. 
 
 At 3 a.m. Sunday, deputies were called to the apartment on a report of a verbal argument between two males, said Lauren Lekander, spokeswoman for the Douglas County Sheriff’s Department. 
 
 Spurlock said Riehl’s roommate, who has not been identified, gave deputies a key to enter the apartment about 5:35 a.m. Riehl, who knew they were coming, ambushed the deputies after they entered the apartment. 
 
 SWAT officers entered the house at 7:30 a.m. and exchanged gunfire with Riehl. Officer O’Donnell was wounded at that time. 
 
 “It’s a terrible incident,” Baldwin said. “We offer our deepest sympathies to the victims and their families.” 
 
 It appears most of Riehl’s legal career was spent in Wyoming. 
 
 At one point he worked with Macpherson Kelly & Thompson, but in 2014 he opened his own practice, according to a notice from the Rawlins-Carbon County Chamber of Commerce in Rawlins. 
 
 Riehl, as a legal intern, worked with the state of Wyoming on a case involving the appeal of a defendant named Blake Leavitt. Police in Alton in 2009 responded to reports of a man spinning his tires, and a high-speed chase began. The court found Leavitt attempted to run over an officer when his car was cornered. Riehl worked on the team representing the state of Wyoming, according to the website FindLaw. 
 
 Another case he assisted with while an attorney at MacPherson Kelly & Thompson involved a general contractor who sued the town of Baggs over whether a payment was a “final payment.” Riehl was on the losing side in that civil case, FindLaw said. 
 
 Denver Post staff writers Noelle Phillips and Aldo Svaldi contributed to this report. 

 Tributes to a sheriff's deputy killed in a shootout are seen outside a Douglas County, Colo., Sheriffs Department substation Monday, Jan. 1, 2018, in Highlands Ranch, Colo. A few deputies were shot, one... (Associated Press) 
 
 Tributes to a sheriff's deputy killed in a shootout are seen outside a Douglas County, Colo., Sheriffs Department substation Monday, Jan. 1, 2018, in Highlands Ranch, Colo. A few deputies were shot, one fatally, while responding to a call at a nearby apartment complex early Sunday. (AP Photo/David... (Associated Press) 
 
 DENVER (AP) — Colorado authorities were contacted with concerns about the mental health of Matthew Riehl over a month before he shot and killed a deputy and wounded four others. But the 37-year-old man was never held for a mental health evaluation. 
 
 Authorities say Riehl fired more than 100 rounds in his suburban Denver apartment before he was killed by a SWAT team on Sunday. 
 
 Wyoming College of Law students had been warned about Riehl, a former student, because of social media posts critical of professors at the school in Laramie, reported KTWO-AM in Casper, Wyoming. 
 
 A Nov. 6 email from Assistant College of Law Dean Lindsay Hoyt told students to notify campus police if they spotted Riehl or his car near campus. In addition, security on campus was increased for several days. 
 
 Campus officers called police in Lone Tree, Colorado, in mid-November to warn them about Riehl, suggesting his rants were indicative of mental illness, UW Police Chief Mike Samp told The Denver Post. 
 
 Samp said it's possible that Colorado authorities faced the same issue as Wyoming officials when an apparently mentally ill, dangerous person makes indirect threats. 
 
 "Wyoming statutes are pretty clear: If someone is not making an immediate threat, they cannot be held for a mental evaluation. They are very tough cases," Samp said. 
 
 Riehl, an attorney and an Iraq war veteran, had also posted videos criticizing Colorado law enforcement officers in profane, highly personal terms. 
 
 Early Sunday, authorities responded to a complaint of a verbal disturbance involving two men at an apartment building in Highlands Ranch, 16 miles (about 25 kilometers) south of Denver. A caller said Riehl was acting bizarre and might be having a mental breakdown, but responding deputies found no evidence of a crime and left. 
 
 When deputies were called back to the scene, a man who had left gave them a key and granted permission to enter the apartment. 
 
 Douglas County Sheriff Tony Spurlock said deputies came under fire almost immediately after trying to talk with the suspect, who was holed up inside a bedroom. 
 
 "They all went down almost within seconds of each other, so it was more of an ambush-type of attack on our officers," Spurlock said. 
 
 The wounded deputies tried to pull the fallen officer, Zackari Parrish, out of the line of further gunfire but were unable to because of their own injuries and only managed to "crawl to safety," Spurlock said. Two civilians also were injured. 
 
 All of the wounded except Deputy Jeff Pelle, 32, have been treated at hospitals and released. The son of Boulder County Sheriff Joe Pelle was in fair condition. 
 
 Hundreds gathered Monday night for a candlelight vigil for Parrish inside Mission Hills Church in Littleton, Colorado — the church he attended with his wife and two young daughters. 
 
 "I've heard from so many different people that he just loved his community and being a police officer," Mission Hills Pastor Craig Smith told KDVR-TV. 
 
 "Zack didn't see law enforcement as a job. He saw it as a calling, as a way to serve his community and a blessing."
– Colorado authorities were contacted with concerns about the mental health of Matthew Riehl over a month before he shot and killed a deputy and wounded four others. But the 37-year-old man was never held for a mental health evaluation, the AP reports. Authorities say Riehl fired more than 100 rounds in his suburban Denver apartment before he was killed by a SWAT team on Sunday. University of Wyoming College of Law students had been warned about Riehl, a former student, because of social media posts critical of professors at the school in Laramie, reports KTWO-AM. A Nov. 6 email from Assistant College of Law Dean Lindsay Hoyt told students to notify campus police if they spotted Riehl or his car near campus. In addition, security on campus was increased for several days. Campus officers called police in Colorado in mid-November to warn them about Riehl, suggesting his rants were indicative of mental illness, UW Police Chief Mike Samp tells the Denver Post. Samp says it's possible that Colorado authorities faced the same issue as Wyoming officials when an apparently mentally ill, dangerous person makes indirect threats. "Wyoming statutes are pretty clear: If someone is not making an immediate threat, they cannot be held for a mental evaluation. They are very tough cases," Samp says. Riehl, an attorney and an Iraq war veteran, had also posted videos criticizing Colorado law enforcement officers in profane, highly personal terms. Hundreds gathered Monday night for a candlelight vigil for Zackari Parrish, the 29-year-old deputy killed by Riehl, inside Mission Hills Church in Littleton, Colo.—the church he attended with his wife and two young children.