The investigation into the Las Vegas massacre Stephen Paddock just keeps getting more and more strange. Since the shooting massacre that took the lives of 59, and injured hundreds of others in Las Vegas at the Rt. 91 country music festival, we ve seen several timeline changes, a lockdown of the Las Vegas coroner s office, a very strange protection around the  security guard  at the Mandalay Bay Casino and Resort, including an armed guard and a scripted appearance on the Ellen Show. And now like some of the most well-known mass shooters before him, Stephen Paddock s hard drive is missing ?ABC News  A laptop computer recovered from the Las Vegas hotel room where Stephen Paddock launched the deadliest mass shooting in U.S. history was missing its hard drive, depriving investigators of a potential key source of information on why he killed and maimed so many people, ABC News has learned.Paddock is believed to have removed the hard drive before fatally shooting himself, and the missing device has not yet been recovered, sources told ABC News.Investigators digging into Paddock s background also learned he purchased software designed to erase files from a hard drive, but without the hard drive to examine it is impossible to know if he ever used the software, one source said.The absence of substantial digital clues has left investigators struggling to piece together what triggered Paddock to kill 58 innocent concertgoers and injure more than 500 others on Oct. 1.Did Paddock remove the hard drive or is there something more to this story? Is there some connection to evidence being removed from laptops or cell phones from suspects of 3 of the most well-known mass shooting cases in America?According to ABC News (who dismisses this curious evidence as a casual coincidence):In 2007, Virginia Tech shooter Cho Seung Huiremoved the hard drive of his computer and disposed of his cell phone shortly before the massacre. Authorities even searched a pond for the missing digital media, but the devices were never recovered.The 2008 Northern Illinois shooter, Steven Kazmierczak, removed the SIM card from his phone and the hard drive from his laptop, and neither was recovered.In 2012, Sandy Hook shooter Adam Lanza had removed the hard drive from his computer and smashed it with a hammer or screwdriver. 