Patrice Mathieu was 52 when he left his home on Catherine Street in Saint-Joseph-de-Sorel, Quebec, in the late afternoon of April 2, 2013, and was not seen again. He was reported missing the next day. At the time he disappeared he was described as 5 feet 6 inches tall, about 156 pounds, with white hair and blue eyes. He was last seen wearing a black mid-thigh length hooded coat, a tuque and blue jeans, and he may have been wearing eyeglasses.

Mathieu did not own a vehicle and usually travelled on foot, so it was believed he may have stayed in the Sorel-Tracy area. Family described him as quiet, anxious and withdrawn, and authorities said there were reasons to fear for his wellbeing. The Sûreté du Québec handled the investigation and asked anyone with information to contact their criminal information centre.

If anyone saw Patrice around April 2, 2013, or has information about his movements that afternoon, please come forward.