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 mostly bore that burden in private but recently sought treatment for depression from the Army, according to a U.S. official.

In text messages to his ex-girlfriend, the soldier raised the curtain on the stress he felt by reliving the violence of his deployment.

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.