A Tennessee man suspected of killing his girlfriend has been killed in a standoff with police.

Thirty-five-year-old Matthew Luther McGinnis died Thursday night at the same Antioch home where he's accused of fatally shooting 39-year-old Nicole Lee Stephens on Sunday before hiding her body.

News outlets report Metro Nashville SWAT officers who confronted McGinnis say he shot himself in the head nearly simultaneously to an officer firing. State Bureau of Investigation spokesman Josh DeVine says the officer's shot hit McGinnis but it's unclear which shot was fatal.

An undercover Metro police gang unit detective, Chris Key, fired at McGinnis. The detective is on "routine administrative assignment" during the Bureau of Investigation's analysis.

A possible motive in Stephens' slaying hasn't been released. McGinnis had a history of domestic violence-related convictions.