The Pennsylvania State Police is looking for information in the 44-year-old unsolved homicide of a Marine corporal along the Pennsylvania Turnpike.
Cpl. Robert Daniel Corriveau, finally identified by DNA earlier this year, had been known only as John Doe since he was found dead about a mile east of the Downingtown Interchange in Chester County on November 18, 1968.
Corriveau, an active duty Marine wounded in action three times in Vietnam the previous year, had been stabbed in the heart just shy of his 21st birthday and was left to die along the highway with no identification, according to police.
Corriveau was originally from Lawrence, Massachusetts and was a patient at the Philadelphia Naval Hospital, where he was receiving psychiatric treatment for a combat-related condition. He was discovered missing by hospital staff the day he was found dead, police said.
He previously received treatment at the Chelsea Naval Hospital in Massachusetts.
State police are asking for the public's assistance in recalling any details that could help solve the case, including members of the Marine Corps or Navy who may have served with Corriveau and Naval personnel or patients who were at the Philadelphia Naval Hospital in October and November 1968.