Master Sgt. Matthew Livelsberger, a U.S. Army Green Beret, is the suspect in the Cybertruck explosion on New Year's Day, authorities said.

Livelsberger, 37, messaged ex-girlfriend Alicia Arritt about the vehicle before he fatally shot himself inside the Cybertruck which erupted in flames outside Trump International Hotel in Las Vegas on New Year's Day, per the Denver Gazette. Newsweek has reached out to Alicia Arritt via Facebook and the FBI via email for comment.

Matthew Livelsberger left his Colorado Springs home the day after Christmas following an argument with his wife over apparent infidelity, two sources familiar with the investigation told The Post.