Federal officials have opened a civil rights investigation into the deadly shooting at a church in Tennessee.

The FBI and U.S. attorney's office are now both involved in the case.

The suspect, Emanuel Samson, will be charged with murder and attempted murder.

Samson allegedly shot and killed a woman in the parking lot of the Burnette Chapel Church of Christ in Antioch, then went inside where he allegedly shot six more people.

A 22-year-old usher ultimately stopped him.

"Mr. Robert Engle, the usher, physically engaged the shooter and during the struggle, the shooter was shot,” says Chief Steve Anderson with the Metro Nashville police. “At this time, we don't know exactly how that happened, whether he shot himself or whether the gun discharged during the struggle. Mr. Engle sustained serious injuries himself and he's the hero. He's the person that stopped this madness and so we're very, very, very grateful to him."

According to police, Samson once attended the church, but there's no word on why he allegedly committed the shooting.