Alison's twin sister Courtney was pretending to be her, which got Alison mad, so she pushed her in the hole, killing her.
"A" killed him
A
No
'A' in Pretty Little Liars is alive at the moment in the show but later gets killed by Spencer.
it was her stalker
He wasn't.
Alison.
Ali killed Ali!
no
Ali killed her.
because she is A.
alison did