Police search for a motive in fatal shooting at a Tennessee church

25-year-old Emanuel Samson, a Sudanese immigrant, is in custody and is being held without bond.
1:18 | 09/26/17

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Transcript for Police search for a motive in fatal shooting at a Tennessee church
church shooting in Tennessee. The suspect behind bars. And authorities now say he had been to that church before. Here's Steve osunsami. Reporter: Tennessee police tonight are holding the accused murderer, 25-year-old Emanuel Samson, without bond, and say more charges are coming. This is a level one mass casualty incident. Reporter: They were just getting out of Sunday services at this Nashville church when police say the Sudanese immigrant pulled into the parking lot with three pistols and a rifle. Witnesses say when 39-year-old Melanie crow walked out, he gunned her down. There's no understanding evil. There's no understanding hate. Reporter: Police say Samson had attended services at the church before. Six other people, including the pastor, were wounded. We got a possible six victims. The suspect is down. Reporter: The morning of the shooting, it looks like he posted these pictures from the gym, in "Beast mode" on Facebook. He also put up strange messages, including "Become the creator instead of what's created." Police have stopped short of explaining a motive, but their reports say Samson's father thought he was suicidal in July. Sunday's shooting was stopped by a church usher who fought with him. Caleb Engle got a gun from his own car and held him until police arrived. Police say that 22-year old usher saved lives. And they're calling him a hero. David? Steve, thank you.

This transcript has been automatically generated and may not be 100% accurate.

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