I found this The legend of it here in Jackson, Michigan goes like this: A long time ago there was a little girl named Mary. She must have gotten in an accident because she went into a coma. At this time doctors didn't know what a coma was, so they thought she was dead. They buried her alive! Every night Mary's mother thought that she heard a scream coming from Mary's grave, but no one believed her.
Finally one day Mary's mother convinced them to dig up her grave. When they did, they found scratches on the top of the coffin and Mary's fingernails were all bloody. There are many different things that I have heard that will happen when you say "Bloody Mary" in the mirror. The most popular one here is that you will see Mary in the mirror walking down a case of stairs. She may be holding a knife. If she is, you must turn on the lights or she'll kill you. Also she could be holding a rose or teddy bear, and then she won't kill you.
Mary's "so called" grave is also here in Jackson. I have been to it. It's out in the woods and you have to walk through a lot of trails to get there. When you finally do, you have to walk up a big hill and there is a big tombstone on top that just says Mary. There are also other tombstones, too. Mary's grave was removed recently because the coffins were beginning to stick out of the ground.