FORT CARSON, Colo. (AP) -- An Army sergeant has been found guilty of unpremeditated murder in the killing of a fellow soldier at Fort Carson in Colorado.

A military panel convicted Sgt. Vincinte Jackson after several hours of deliberation on Thursday. Sentencing was underway.

Jackson's lawyers conceded he killed 28-year-old Spc. Brandy Fonteneaux of Houston but argued that the slaying was so brutal and random that it couldn't have been premeditated.

They also said a combination of heavy drinking and a prescription antidepressant left Jackson unable to control his own actions.

Prosecutor Capt. Jason Quinn scoffed at that argument.

Quinn said Jackson made a conscious decision to leave his room and walk to Fonteneaux's, where he stood over her while she slept.