Terror In DC: What We Know About Navy Yard Gunman Aaron Alexis [PHOTOS]
In attempting to determine a motive, authorities reached back into Alexis' past and uncovered two of his arrests. In 2004, he was charged with malicious mischief in Seattle for shooting out the tires of a construction worker's vehicle because he claimed the person disrespected him. In 2010 while living in Forth Worth, Alexis accidentally fired a gun in his home that he claims was being cleaned. After facing a misdemeanor charge of recklessly discharging the firearm, the police couldn't prove he was intentional in his firing of the gun.