A 72-year-old Sunshine man was killed Sunday afternoon after he was thrown from his motorcycle when it struck a curb on Siegen Lane, just north of Perkins Road, a State Police spokesman said.

Thomas W. Duke was pronounced dead at the scene by the East Baton Rouge Parish Coroner’s Office following the 1 p.m. accident, Trooper First Class Jared Sandifer said.

Duke was driving his 2002 Harley-Davidson south on Siegen Lane when it ran off the road to the right, struck a concrete curb and threw Duke from the motorcycle, Sandifer said.

Driver distraction may be a factor in the crash, Sandifer said.

Duke was wearing a helmet, but it was not one approved by the Department of Transportation, Sandifer said.

Troopers closed both southbound lanes for about two hours following the accident, Sandifer said.

The crash remains under investigation.