FORT CARSON, Colo. — Attorneys for a Fort Carson soldier charged with murder in the death of his soldier-girlfriend say he didn't intend to kill her and shouldn't be found guilty of murder.

In closing arguments Wednesday, the defense said Sgt. Montrell Lamar Anderson Mayo should be convicted of only manslaughter because he was in a "state of madness" when he and Sgt. Kimberly Walker quarreled and fought on Valentine's Day 2013.

Prosecutors argued Mayo should be convicted of premeditated murder because he hit Walker three times and smothered her when he realized she was still alive.

Mayo's lawyers said prosecutors didn't prove he meant to smother Walker and suggested her posture had cut off her air supply as she lay unconscious.

If convicted of premeditated murder, Mayo faces up to life in prison.