The sentencing phase gets underway this week in the trial of Fort Hood shooter Maj. Nidal Hasan.
Hasan, 42, was found guilty last week in the 2009 Army base massacre that left 14 people, including an unborn baby, dead.
He was convicted of 13 charges of premeditated murder and 32 charges of attempted murder.
The Army psychiatrist admitted to the killings and said he was an Islamic holy warrior fighting U.S. troops.
He is eligible for the death penalty. At the very minimum, he could spend the rest of his life in prison.