McClellan and his wife made it out safely when a gunman opened fire at the Route 91 Harvest music festival on October 1, killing 58 people, his widow said.

"I don't understand why he wasn't taken at the shooting, but a month later he was taken this way," McClellan's widow, Denise, told CNN affilliate KSNV. "I hope my husband found peace and he's safe now."

The shooting "was really messing" with McClellan's head and "he was going to therapy," she told the affiliate.

Authorities found the car involved in the crash and charges against the driver are pending, KSNV reported.

McClellan is not the only survivor of the Las Vegas massacre who has died in the past weeks.