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Uncredited, Associated Press
This booking photo provided by the Fort Worth Police Department shows Aaron Alexis, arrested in September, 2010, on suspicion of discharging a firearm in the city limits. The FBI has identified Alexis, 34, as the gunman in the Monday, Sept. 16, 2013 shooting rampage at at the Washington Navy Yard in Washington that left thirteen dead, including himself.

Aaron Alexis, the suspected gunman in the U.S. Navy Yard shooting episode that left 13 people dead, had a checkered past that included run-ins with gun charges, violent video games and alcoholism.

“Mr. Alexis was a New York native who lived in Fort Worth, Texas, and worked in a Navy fleet logistics support squadron based there before he was discharged from the military after a 2010 arrest for firing a gun at his apartment,” Ana Campoy and Nathan Koppel reported for the Wall Street Journal. “The incident sent a bullet into a neighbor's property a few days after an alleged confrontation with the neighbor over noise.”

After speaking with the suspect’s best friend, Nutpisit Suthamtewakul, The Telegraph’s Nick Allen wrote, “The darker side to Alexis's character saw him playing violent ‘zombie’ video games in his room, sometimes from 12:30 pm until 4:30 am. Mr Suthamtewakul said: ‘He could be in the game all day and all night. I think games might be what pushed him that way.’ “

The Washington Post reported, “Alexis drank alcohol frequently and in large quantities, Suthamtewakul said: ‘He can start drinking at 9:30 in the morning. He drinks often and for fun, but it was never a problem.’ Asked what he will remember about his friend, Suthamtewakul said, ‘Him with a Heineken.’ ”