Mary was a "special" kid to her parents, she had a hobby around 5 where she used to clean every spot around the house, when she turned 8, her father was in a drunken state, he threw a wine glass at Mary, it hit and damaged her left knee, she almost felt the bone broke, when she got older at 13, she found a chainsaw and a knife, she killed her parents, as revenge on her dad, Mary was too insane that she killed her mother that loved her dearly by accident, Mary later cut herself accidentally on the knife, since she liked to cook and read, she turned her parents into a pie, Mary cleaned up mess very well, so it would look like her parents took their own life...

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Once Mary left a hospital to "cure" her violent actions, she didn't like being there and wanted to leave, the doctors said she couldn't until she was around 18, Mary was 17, she saw that the window was open, it was a 2nd floor window and not very high, but she did fall into a bear trap, she was half alive half dead, she now has serious trauma and tries to hide it at all costs, once she got up and ran off to escape, which she did, she ran into slenderman, becoming a proxy.