The FBI believe that a Green Beret who blew up a Cybertruck in Las Vegas was suffering from mental health issues and wanted to end his life with a "stunt."

The highly decorated special forces soldier in a Cybertruck explosion in Las Vegas told a former girlfriend he faced pain, exhaustion after Afghanistan.

In a Saturday night email from the U.S. Army Pentagon, a spokesperson said Master Sgt. Matthew Livelsberger, the Las Vegas Cybertruck explosion suspect, displayed no signs of concerning behavior leading up to his leave or his suicide.

Master Sgt. Matthew Livelsberger, an active duty Green Beret for almost 20 years, shot himself just before the truck exploded, police said.

The attack in Las Vegas carried out using Tesla's Cybertruck reveals a personal tragedy involving a US Army soldier. The assailant left behind a letter that provides new insight into the events in Las Vegas.