The Las Vegas gunman behind the deadliest mass shooting in modern U.S. history spent decades stockpiling guns and living a “secret life” that investigators may never be able to fully understand, police say. Clark County, Nev., Sheriff Joseph Lombardo said Wednesday that it was only logical to “make the assumption” that Stephen Paddock had “some help at some point” in pulling off Sunday’s massacre. As evidence, Lombardo pointed to gunman Paddock’s huge arsenal, explosive materials found in his car

and his meticulous planning. “What we know is Stephen Paddock is a man who spent decades acquiring weapons and ammo and living a secret life, much of which will never be fully understood,” the sheriff said. Authorities also revealed that they believe Paddock had an escape plan, even though he turned the gun on himself as police closed in on his luxury suite at the Mandalay Bay Resort and Casino. Paddock killed 58 people and injured hundreds in the attack as he fired from his room on the 32nd floor. READ MORE