Sylvie Ouimet was about 20 when she disappeared from Montreal in the spring of 1975, around April 1. Living with her parents in Laval, she was under care at the Albert-Prevost Institute in Montreal for suicidal thoughts. The day she vanished she walked away from the hospital and left all of her personal belongings and identification behind.

Sylvie was described as slender, 5 feet 4 inches and about 124 pounds, with brown hair and blue eyes. She had a burn mark on one forearm and a surgical scar behind one ear. Clothing reports vary: a green blouse, light blue jeans and brown shoes are mentioned, and another report says she may have been wearing a red coat. Her leaving without possessions raised immediate concern and her state of mind that day remains a central question.

Anyone who knew Sylvie, lived near the hospital in 1975, or has information about her movements that spring is asked to come forward.