A 25-year-old Maryland man has been identified as the motorcyclist who died Saturday afternoon when he crashed in the District’s Third Street Tunnel.

Police said Sean Ray Aultmon of District Heights was driving a 2005 Suzuki GSXR 1000 south on I-395 when he tried to pass a slower car and hit a concrete Jersey barrier on the east side of the road.

The accident occurred about 5:30 p.m. Police said Aultmon was pronounced dead at the scene.

Authorities said the crash remains under investigation. They did not say whether Aultmon was wearing a helmet.