Matthew Livelsberger, a 37-year-old Green Beret, died from a self-inflicted gunshot wound prior to the Tesla Cybertruck explosion in Las Vegas.
Evidence found inside the vehicle includes multiple IDs, a handgun, and a semi-automatic rifle, all legally owned by Livelsberger.
The FBI is investigating the incident as a possible terrorist act but found no definitive ties to another attack in New Orleans on the same day.
Livelsberger served multiple tours in Afghanistan and showed signs of psychological distress following a brain injury, according to those close to him.
Authorities confirmed the explosion was likely caused by large fireworks or an explosive material stored in the truck, possibly directed upwards.
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