The Haunted Mansion ride at Disney Theme Parks: the Ghost Host is a man who hung himself, as he reveals in the stretching room. He is generally thought to be Master Gracy, though the two are officially separate characters. This idea was eventually used in the first movie.
The French version, Phantom Manor, has this man murdered by demonic lord of the house. But, it has a Shoot the Shaggy Dog ending; where a bride-in waiting, tormented by the Phantom to the point of losing her youth/beauty/happiness, finally just gives in and accepts death.
A rumor was that an employee who worked for Disney committed suicide because he could not listen to It's a Small World all day. In reality an employee did committ suicide in the park but their body was not near any of the rides.