The last episode of season 2! Episode 25.
Season 2 episode 9 :)
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.
-A will be revealed on March 19th 2012 But their will be a total cliffhanger and Pretty Little Liars will end somewhere in 2013.
1 Pretty Little Liars2 Flawless3 Perfect4 Unbelievable5 Wicked6 Killer7 Heartless8 Wanted9 Twisted10 Ruthless11 Pretty Little Secrets
No. Courtney is dead
Courtney
Courtney is alison's twin sister, who pretended to be her
You find out about Courtney in the book Wanted.
Courtney was in the hospital because she had mentel issues.
Actually no...
Alison
Suffication
by hands
The real Ali killed her twin Courtney. Courtney was friends with the Pretty Little Liars. Ali didn't like Courtney.
The First episode of Pretty Little Liars was Pilot and the second episode was the Jenna thing ! Hope his helps ;)
Ali (the real Ali) kills Courtney.