Matthew Livelsberger, the 37-year-old man now deceased and suspected of plotting the Cybertruck explosion that occurred on New Year’s Day outside the Trump International Hotel in Las Vegas, allegedly owned a “manifesto” detailing his theories about mysterious drones recently spotted on the East Coast.

"I think it was even harder for him, being on active duty -- the shame and the stigma. He wanted to get more help," an ex-girlfriend said.