A man in his 40s was killed Sunday night when he apparently crashed his motorcycle on the eastbound lane of Storrow Drive near the exit for Charles Circle, Suffolk County prosecutors said.

A Massachusetts State Police officer traveling on Storrow Drive at about 10:30 p.m. Sunday discovered the man lying in the roadway near a Harley Davidson motorcycle flipped on its side. The man was wearing a helmet, said Suffolk District Attorney Daniel F. Conley in a statement.

The officer called for medical assistance, but the man had died of his injuries.

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Officials described the stretch of Storrow Drive where the crash occurred as a tight curve, and investigators observed scrape marks on the pavement, the curb, and a nearby barrier.

Investigators are examining the circumstances of the crash, prosecutors said.

State troopers and detectives assigned to the district attorney’s office responded to the scene, along with Boston fire and rescue workers, as well as the State Police crime scene and crash reconstruction teams.

The identify of the man is being withheld until his next of kin is notified, prosecutors said.