Thirteen people were killed, including Alexis, 34, and several more have been injured.
Alexis, who recently began working at the yard as a civilian contractor, entered the facility with a handgun and two assault rifles, the Washington Post reports.
The Seattle Times reports that in 2004, Alexis was arrested for what was described by authorities as a “blackout” fueled by anger, which involved shooting out the tires of another man’s vehicle.
Two construction workers had parked in the driveway of a work site next to a home where Alexis was staying. Witnesses saw a man, later identified as Alexis, walk out of the home, remove a gun from his waistband and shoot three rounds into the back tires of the car. He then reentered the home.
According to the Associated Press, in 2010, Alexis was arrested in Fort Worth, Texas for shooting a gun within city limits, but was not charged with a crime.
The Guardian reports Alexis’ home of record is listed as New York City. The publication also notes that he was a Navy aviation electrician’s mate 3rd class and from 2008 to 2011, working in the Fleet Logistics Support Squadron (VR) 46 in Fort Worth until he detached from the Navy.
According to The Guardian, it remains unclear whether Alexis acted alone on Monday, as police are still seeking a second suspect in connection with the case.