Matthew Livelsberger, left a note claiming the act was a “wake-up call” for the nation’s problems

U.S. soldier Matthew Livelsberger, who died in a Tesla Cybertruck explosion outside the Trump Hotel in Las Vegas, left a note claiming the act was a “wake-up call” for the nation’s problems, investigators revealed.

According to the Clark County coroner’s office, his death was ruled a suicide resulting from a gunshot wound.