Alison was believed to have burned in the fire that she started in an attemp to kill Aria,Spencer,Emily,and Hanna. No bone or tooth was found so it really is a mystery is she really is dead. But for the most part she did get away with it.
Alison's twin sister Courtney was pretending to be her, which got Alison mad, so she pushed her in the hole, killing her.
Yes. Alison had a twin sister named Courtney.
yes
Ally's psychotic sister.
Yes
Obviously. she gave birth to them
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