Federal workplace safety regulators say a St. Louis company whose boiler exploded causing at least three deaths Monday has paid fines for workplace violations three times since 2014. 
 
 Federal workplace safety regulators say a St. Louis company whose boiler exploded causing at least three deaths Monday has paid fines for workplace violations three times since 2014. 
 
 A federal investigation into a St. Louis boiler explosion that killed three people and injured four others, two of them critically, could take months to complete, a spokesman for the investigative agency said Tuesday. 
 
 A federal investigation into a St. Louis boiler explosion that killed three people and injured four others, two of them critically, could take months to complete, a spokesman for the investigative agency said Tuesday. 
 
 Police said two workers were killed during a massive boiler explosion in Soulard on their first day of work. 
 
 Police said two workers were killed during a massive boiler explosion in Soulard on their first day of work. 
 
 ST. LOUIS (KMOV.com) – A fourth person has died following Monday’s boiler explosion in Soulard. 
 
 Thursday morning, the Medical Examiner’s Office said that 53-year-old Clifford Lee of St. Louis died at a St. Louis hospital Wednesday. 
 
 Around 7:45 a.m. Monday, a large industrial boiler exploded at the Loy-Lange Box Company in the 220 block of Russell Boulevard. The equipment, described as a being about the size of a van, shot through the roof of the building and reached a height of between 450 and 500 feet. 
 
 A substantial piece of the boiler traveled around 500 feet laterally, eventually crashing through the roof of the administrative offices of the Faultless Healthcare Linen building, located a block away. 
 
 Watch: Surveillance video shows Soulard boiler explosion 
 
 The initial explosion killed 59-year-old Kenneth Trentham, an employee of the Loy-Lange Box Company. Another Loy-Lange employee was seriously injured and is listed in critical but stable condition. 
 
 Eleven seconds after the initial explosion, a large piece of the boiler tore through the ceiling of the Faultless Healthcare Linen building. It struck two employees, identified as 43-year-old Tonya Gonzalez-Suarez and 46-year-old Christopher Watkins, filling out first-day paperwork, killing them both. 
 
 Lee was inside the Faultless building when the hot boiler, which weighed an estimated 1.5 tons, entered the building. He was reportedly trapped under the hot boiler. After being freed from under the boiler, Lee was taken to the hospital and listed in critical, unstable condition. He was pronounced dead on Wednesday. 
 
 A GoFundMe account has been set up by the family of Gonzalez-Suarez to help the two children she leaves behind. 
 
 Another GoFundMe account was set up to help the families of the victims by an organization called "Sons & Daughters of Soulard," made up of charitable and community-minded business leaders in Soulard. 
 
 
 
 The City of St. Louis does not inspect commercial boilers. However, any business with a boiler must have a city-licensed engineer on staff whenever the equipment is running. Trentham was the engineer on staff at the time of the explosion. He had been licensed since 1996 and had renewed his license every year. 
 
 The boilers were installed in 1966 and 1968. According to company permits, they were manufactured by a company called Clayton. They are made of steel and the permits say all materials comply with code. 
 
 The incident has been classified as a commercial accident. 
 
 Read: Box company paid $12,700 fines for safety issues 
 
 Loy-Lange has paid fines for workplace violations three times since 2014, though officials say none were related to the boiler. 
 
 The company paid a $3,741 fine after an August 2016 inspection found holes in floors that prevented proper cleaning. 
 
 An inspection in November 2014 found defective equipment, including a forklift without lights and damage to some safety latches. The company paid $6,566. 
 
 And in February 2014, the company paid $2,450 for defective energy control procedures, such as not properly training employees to ensure machinery was turned off and powered down. 
 
 Officials say the company has since addressed those issues. 
 
 Photos: Explosion in Soulard | Mobile users click here 
 
 The Faultless Healthcare Linen Company issued the following statement regarding the accident: 
 
 “Our concern first and foremost is for our affected employees and those of Loy Lange and their families. We have been informed that a fire of unknown origin erupted this morning at the Loy Lange property adjacent to our Faultless Healthcare Linen plant at 2030 South Broadway; that material from the Loy Lange fire came onto a portion of our building; and that as a result there are said to be injuries and fatalities among our Faultless Linen employees. At this time, the extent of the injuries and the names of those injured or killed have not been released. We immediately will be giving what practical help we can to our employees and their families. We are grateful to the firefighters and other emergency responders who have acted heroically in response to this tragic event. We intend to update this statement when we have more information later this morning.” 
 
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– A bizarre and deadly accident happened in St. Louis on Monday when a 1.5-ton boiler exploded, killing one person—with the force of the blast then propelling the boiler out of the building and through the roof of another, with equally deadly consequences. The St. Louis Post-Dispatch reports the incident occurred early Monday in the Loy-Lange Box Company; the boiler flew 500 feet and landed on the Faultless Healthcare Linen building. When rescue teams arrived at the latter building, they found two dead, with a third person alive but trapped under the cast-iron boiler; that victim has been hospitalized in critical condition. St. Louis Fire Chief Dennis Jenkerson doesn't suspect foul play and says maintenance records and schedules will be reviewed—while noting the boiler was still hot when he arrived 15 minutes after the explosion. "These boilers, when they get pressurized they get very dangerous," Jenkerson tells KMOV. "It takes a licensed boiler operator to operate these things." Another nearby building was also damaged by way of an 8-foot-long pipe that took out its sprinkler system. One unnamed Faultless worker tells the Post-Dispatch that a secretary and two workers who had recently joined the company were those involved, though police haven't released such details. "That boom is in my mind," he says. "It's a thing you don't forget."