Alison had a twin named Courtney but Courtney was mentally ill so no one knew about her so Courtney always pretended to be Alison so the parents sent Courtney away to a mentally ill hospital but she escaped then when she came back she acted like she was Alison and the parents acdently sent away the real Alison so then
the fake Alison (the one everybody knew and loved was really the mentally ill one) The fake one ditched all the real ones Friends and got with Hanna Spencer Emily and aria then the night the fake one went missing the real one escaped and the real Alison was so mad she killed and buried the fake Alison (that's how she died) then when Maya put all the fake ones stuff outside Mona found it and read all of her things Du see the fake one had wrote n down all the 4 girls secrets down in journals and that's how it happened contact me for Fragen :).........