A recently published story by The Navy Times provides some new details about the Navy career of Aaron Alexis, the man who authorities say killed 12 people at the Washington Navy Yard Monday.

According the report, Alexis was known as a below-average plane mechanic, who fellow squad members saw as a loner. The Navy Times also reports Alexis got in fights off-duty and felt persecuted by his command at Fleet Logistics Support Squadron 46 which was based in Atlanta at the time.

The article also quotes a leader of Alexis' former squadron as being shocked when he found out Alexis was named as the shooter.