Because Courtney was certifiably insane. She tried to switch places with Alison. Courtney ditched Naomi and Riley, and then made friends with Aria, Hanna, Emily, and Spencer. Alison got very mad at her, because Courtney was supposed to go to the mental hospital, but since they switched places, Alison went instead. Since they were twins, and nobody knew about it, they thought it was Alison's body in the hole. But it wasn't, it was Courtney's.
Hope that helped!
-A
no , ali killed courtney who was pretending to be ali
As far as the book is concerned, Toby commited suicide. Alison only killed Courtney Dilaurentis, Ian Thomas, and Jenna Cavanaugh.
NO! Alison killed Courtney in the books. Melissa and Ian did not.
No, Ian Thomas did not kill Alison DiLaurentis. The killer is Alison's twin, Courtney DiLaurentis. In the book Ali's Little Lies, it shows that Courtney definitely killed her twin, Ali, but she had an accomplice, which the real Courtney knew just as she died, and Sara Shepard says the accomplice will be revealed, (possibly as A)
Ian did NOT kill Alison. He had a secret relationship with Alison behind Melissa's (Spencer's older sister) back. If you haven't read the book, I highly suggest reading it.
Ian's inocent except for the fact that he tried to kill Spencer
Ian isn't A, Courtney who is Alison's twin was murdered by Alison ..Mona is -A but after Mona dies and tries to kill Spencer ; Ali becomes -A to mess with the Pretty Little Liars.
alisons isn't even dead its her twin sister Courtney that was killed . alison and mona are A
Since it seems that you know that Ali had a twin, Ian DID NOT kill Courtney. The real Ali killed Ian maybe on suspicion that Ian had found out the truth about what happend the night "Ali" disappeared.
Not really he just did some bad things but he didnt kill alison
Alison and Ian were in a secret relationship. The night Ali left the barn she was going to meet Ian...
Ian didn't kill Alison, there is more to the video and after it shows her hand on the floor she gets back up, hugs him and goes back to the girls meanwhile someone killed her on her way back