Fort Hood shooting case could face years of appeals if prosecutors win a death sentence

Hundreds of unarmed soldiers were waiting inside a building for vaccines and routine checkups when a fellow soldier walked inside with two handguns and enough ammunition to commit one of the worst mass shootings in American history.

Maj. Nidal Malik Hasan is to go on trial Tuesday for the November 2009 rampage at Fort Hood, Texas, which left 13 people dead and more than 30 others wounded.

If he is convicted and sentenced to death, there are likely years of appeals ahead.

The Hasan case is unusually complex, and experts say the military justice system is unaccustomed to dealing with death penalty cases and has struggled to avoid overturned sentences.