The gunman in the Fort Hood shooting was an active-duty enlisted soldier who served four months in Iraq and was being evaluated for PTSD, military officials said Wednesday night.
Ivan A. Lopez, 34, had previously served in the Army National Guard in Puerto Rico, a military official said. He was assigned to the 13th Sustainment Brigade at Fort Hood.
Officials said he was being treated for depression, anxiety and other behavior and mental issues but had not yet been officially diagnosed with post-traumatic stress.
"He was undergoing a diagnosis process," Lt. Gen. Mark Milley said.
He said the gunman was never wounded in action but "self-reported" a traumatic brain injury.
Lopez was married and lived in the area near the post. His family had not yet been notified.
Three people were shot dead and at least 16 others were wounded in Wednesday's violence. Lopez took his own life, officials said.