CNN Security Clearance

Fort Hood shooting spree: 'Texans' hearts are once again very heavy'

By Tom Watkins, Ben Brumfield and Josh Rubin

A day after a shooting spree at Fort Hood, Texas, left three soldiers dead and 16 wounded, a profile emerged Thursday of the killer as an experienced soldier who was grappling with mental illness, but no answers were forthcoming as to a possible motive.

The incident began Wednesday at 4 p.m., when Spc. Ivan Lopez, 34, went from one building at the sprawling Texas military base to a second, firing his .45-caliber handgun.

Lopez then put the gun to his head and pulled the trigger, ending his life.

Investigators have downplayed the possibility that terrorism may have been involved, but said they were keeping open minds.