Nidal Hasan, seen here in 2010, has been sentenced to death for killing 13 people and wounding more than 30 more in a shooting rampage at Fort Hood, Texas, in 2009. Bell County Sheriff's Office handout/Getty Images hide caption

itoggle caption Bell County Sheriff's Office handout/Getty Images

Maj. Nidal Hasan faces 13 counts of premeditated murder and 32 of attempted murder for the November 2009 shootings at Fort Hood, Texas. Bell County Sheriff's Office/Reuters/Landov hide caption

itoggle caption Bell County Sheriff's Office/Reuters/Landov

Maj. Nidal Hasan faces 13 charges of murder and 32 of attempted murder for the November 2009 shootings at Fort Hood. A Muslim, he has refused a judge's order to shave his beard, though it violates Army regulations. Bell County Sheriff's Office/Reuters/Landov hide caption

itoggle caption Bell County Sheriff's Office/Reuters/Landov

Maj. Nidal Hasan faces 13 charges of murder and 32 of attempted murder for the November 2009 shootings at Fort Hood. A Muslim, he has refused a judge's order to shave his beard, though it violates Army regulations. The trial will proceed, however. Bell County Sheriff's Office/Reuters/Landov hide caption

itoggle caption Bell County Sheriff's Office/Reuters/Landov