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(CNN) A former college football player shot and killed by Charlotte, NC police may have been running towards them for help after a car wreck.

It all started Saturday morning when a woman called 911, telling dispatchers a man had been knocking repeatedly on her door.

When police showed up, a man matching the description ran towards officers.

Police first tried to subdue the man with a stun gun.

When that didn’t work, police shot and killed Jonathan Ferrell.  He did not have a weapon.

Police now believe Ferrell was looking for help after a car crash. His wrecked out car was located nearby.

Officer Randall Kerrick is charged with voluntary manslaughter in the case.

He turned himself in Saturday afternoon and was released on a $50,000 bond.

Jonathan Ferrell was 24-years-old. He played football at Florida A&M University.