Martin has a mental age of four, police say. He is five-foot-eleven and weighs approximately 180 lbs.
He has brown eyes and dirty blond or light brown hair. He may have a faint moustache, according to police.
He left his Outremont home on De L’Épée Street between 2 a.m. and 10 a.m. Saturday, wearing a blue jacket, a baseball cap, black fleece shorts with the word “Brébeuf” on them, and black Velcro running shoes.
Police ask anyone who has seen Martin to call 514-393-1133.