John Thomas Casey, 75, of Milford, Connecticut, was reported missing from the CTMA Vacancier cruise ship during a voyage from Montreal to the Magdalen Islands. He was last accounted for on September 14, 2016, while the ship called at Havre-Saint-Pierre, Quebec. Casey, of Irish descent and an English speaker, is 5 feet 10 inches and about 150 pounds, with white and gray hair, pale eyes and glasses; he was last seen wearing a black coat and a purple shirt.

Relatives alerted ship crew the morning of September 15 when they realized he was missing. The Sûreté du Québec indicated there was information suggesting he may not have disembarked at Havre-Saint-Pierre, so investigators considered possibilities including falling or jumping from the vessel or having disembarked earlier in Montreal. Those who knew him said he could become confused at times, which raised concerns for his safety.

Extensive ground and aerial searches were carried out and police checked local properties, but no clear answers have been provided. If anyone saw John Casey on the voyage or in Havre-Saint-Pierre or Montreal around September 14–15, please come forward with information.