BOSTON (CBS) – Authorities are hoping that identifying a murdered Marine Corporal from Massachusetts killed 44 years ago in Pennsylvania could help solve the case.

Marine Cpl. Robert Daniel Corriveau, who was originally from Lawrence, Mass., was stabbed through the heart on November 18, 1968. His body was discovered that day on the Pennsylvania turnpike.

Police say Cpl. Corriveau?s body was discovered in Chester County, Pennsylvania on the side of a highway about 30 miles northwest of Philadelphia. Cpl. Corriveau didn?t have any identification on him at the time. His remains were only recently identified through DNA testing.

He was an active duty Marine who had been wounded in action on three separate occasions in Vietnam in 1967, and was awarded two purple hearts.

At the time of his disappearance, Cpl. Corriveau was 20 years old and was undergoing combat-related psychiatric treatment at the Philadelphia Naval Hospital.

Robert Daniel Corriveau

Pennsylvania State Police are now asking for the public?s assistance in recalling any details from that time period that could help to solve this case.