[MAP: Ft. Hood in Killeen]
[MASS SHOOTINGS: Timeline of mass shootings in the U.S.]
[INTERACTIVE: Details emerge about suspect's history]
Nonetheless, he was on the mind of federal investigators as they try to figure out why he did what he's accused of doing.
Investigators still believe Hasan acted alone. Despite his, the FBI has found more evidence he could have become a threat.
Just before the memorial service began Tuesday afternoon, four FBI agents showed up at Hasan's mosque in Killeen to sift through the dumpster outside. The agents would not comment on what they were looking for, but authorities are still searching for a clear motive.
Meanwhile more red flags were found: The Washington Post uncovered a PowerPoint presentation Hasan gave to senior army doctors at Walter Reed Medical Center a year and a half ago. It warned that to decrease adverse events, the US military should allow Muslim soldiers to be released as conscientious objectors, instead of fighting in wars against other Muslims. In the comments section of the document, he wrote "We love death more than you love life."
Couple this with as many as 20 emails Hasan sent to this radical cleric in Yemen who authorities consider a recruiter for Al-Qaeda and the questions just multiply.
"All of those are things the major should have been confronted with long before he was put in a position to so some harm," said Rep. Ted Poe.
Poe added that he has no doubt there will be congressional hearings into all the missed opportunities.
Hasan caught the attention of the Joint Terrorism Task Force in December 2008, and they kept him on their radar until early this year.
During that time, intelligence officials intercepted his emails to cleric Anwar Al-Awlaki, but later deemed them innocent or protected by the first amendment.
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