Police said Sergeant Charles Cochran, 45, shot Lemuel Bunn, 40, while he was allegedly attempting to stab his pregnant girlfriend to death.
Bunn died from his injuries at Cape Fear Valley Medical Center.
Officials said the victim, 34-year-old Stephanie Williams, along with her unborn child, are in good condition.
The pregnant victim is recovering at Cape Fear Valley Medical Center. Officials say she and her baby will be all right.
Sgt. Cochran has been with the Fayetteville Police Department since November of 2003, officials said.