RALEIGH — Police think alcohol or drugs played a role in a motorcycle crash that killed a 61-year-old man Sunday morning in South Raleigh.

Police say William Michael McGinley of Garner was driving a 2011 Harley Davidson just after 1 a.m. when he lost control of the bike in a curve on Tryon Road.

The motorcycle ran off the left side of the road and overturned. Emergency workers say McGinley died at the scene, according to an accident report made public this morning.

Investigators determined McGinley was impaired after conducting tests at the crash site, but they were not sure if he was impaired by drugs or alcohol, according to the accident report.

The single vehicle crash occurred in the southeast lanes of Tryon Road between Par Drive and Ileagnes Road, said police spokesman Jim Sughrue.