Haunted Montreal is extremely excited to report a very special event. Canada's most haunted city, Montreal, is nervously awaiting its most infamous ghost. Prostitute Mary Gallagher was brutally murdered and beheaded in a filthy Griffintown tenement on June 27, 1879 on the corner of William and Murray streets. The case shocked Montrealers, especially when Mary's best friend, Suzy Kennedy, was sentenced to hang for the gruesome crime. Since then, Mary's headless ghost is said to return every 7 years on the anniversary of her death, still searching for her head.