North Bay Police are asking the public for help in solving the service's longest unsolved missing person case.

On June 12, 1966, 27-year-old Philippe Guérin went missing from the Ontario Hospital, a psychiatric hospital located in the north end of North Bay and that has since been demolished.

Hospital authorities reported him missing to the Widdifield Police Department via a letter of notification.

The Widdifield Police followed up on a lead from a North Bay clergyman who picked up a hitchhiker matching Guérin's description in the Sudbury area at Falconbridge.

The hitchhiker, who the clergyman dropped off at the junction of Highways 17 and 11, south of North Bay, said he was heading to Sacré-Coeur, Québec.

Philippe Guerin, missing since 1966

Philippe Guerin has been missing since 1966. (North Bay Police)

Widdifield Police were never able to locate Guérin and the investigation, now with the North Bay Police Service, remains unsolved.

At the time he was reported missing, Guérin was described as 5'-7" tall, with a medium build, short brown hair, brown eyes, and he had no upper teeth. When he was 10, Guérin was paralyzed by polio, and walked with a limp.

Police ask that anyone with information contact Detective Constable Roger Drolet at the North Bay Police Service by telephone at 705-497-5555.

For those who wish to remain anonymous, there are three ways to contact Near North Crime Stoppers: call 1-800-222- 8477, or visitnearnorthcrimestoppers.com for information on how to submit an anonymous tip by text or online.