An overnight crash left one man dead.

The Jefferson County Coroner’s Office identified the fatality victim as George Chadwick Mumpower. He was 50 and lived in Helena.

The wreck happened at 10:50 p.m. Wednesday in the 3400 block of Morgan Road.

Authorities said Mumpower was the driver and lone occupant of a Toyota Camry. Details of the crash have not been released, but coroner’s officials said no other vehicles were involved.

Mumpower was pronounced dead on the scene at 11:30 p.m.

Helena police are investigating.