umm because Courtney (her twin) had mental problems and had to go to a mental center place but she didnt want to so she pretended to be alison so her parents sent alison instead of Courtney to the mental center place. alison killed Courtney as revenge
it is alison's sister
Courtney is Alison's twin sister in Pretty Little Liars.
The concept of who killed Alison DiLaurentis changes throughout the entire Pretty Little Liars series. Many people who have been accused with this task are Toby Cavanaugh, Spencer Hastings, Emily Fields, Aria Montgomery, Hannah Marin, Mrs. Hastings (Spencer's mother), Ian, Melissa Hastings, Billy and Jenna. Alison was not actually killed, her twin sister Courtney was. Read all of the Pretty Little Liars series and this answer will make much more sense!
At a mental place. And is made to live her dead twin sister
Ian, who is Spencer's sister Mellisa's husband, kills her.
Yes. Alison had a twin sister named Courtney.
yes
Ally's psychotic sister.
Yes
Obviously. she gave birth to them
Alison DiLaurentis is killed by her twin sister, Charlotte DiLaurentis, also known as CeCe Drake, in the television series "Pretty Little Liars."
Alison killed her twin sister Courtney. The only reason why she killed her is because she stole her perfect little life and alison is in a mental home and Courtney is dead
Courtney is alison's twin sister, who pretended to be her
Yes
Because the Pretty Little Liars weren't actually her friends. Courtney, (Alison's twin sister) made friends with them. Alison had nothing to do with them. So she's mad and tries to kill them.
No the girls do not know.
it is alison's sister