Numerous incidents in Aaron Alexis ' past show that he was troubled , prone to violence . Among them were insubordination , disorderly conduct , drunkenness and unauthorized absences from work , a U.S. defense official said . Navy shooting out the tires of car in Seattle in 2004 is the second in a string of instances . 2010 brings another arrest after Alexis fires a bullet through the ceiling of an apartment . 2010 , 2004 after his Navy discharge , he tells police he heard voices in eight hotels .
Numerous incidents in Aaron Alexis ' past show that he was troubled , prone to violence . Navy shooting out the tires of car in Seattle in 2004 is the second in a string of instances . 2010 brings another arrest after Alexis fires a bullet through the ceiling of an apartment . 2010 , 2004 after his Navy discharge , he tells police he heard voices in eight hotels .