A few days before New Year's Eve, Alicia Arritt was surprised to receive text messages from her ex-boyfriend, Matthew Livelsberger.

A few days before New Year’s Eve, Alicia Arritt was surprised to receive text messages from her ex-boyfriend, Matthew Livelsberger, the man who is responsible for the cybertruck explosion in Las Vegas.

Matthew Livelsberger -- the driver of the Tesla Cybertruck that exploded outside the Trump International Las Vegas Hotel -- shared "grievances" in two letters.

The driver, who died before the blast, urged his fellow servicemembers to force Democrats out of government “by any means necessary.”

Tricia Kean outlines what we're learning about Matthew Livelsberger from his ex-girlfriend, Alicia Arritt. Investigators say Livelsberger died by suicide in the explosion outside the Trump International Hotel last week.