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!
No she did not
The real Alison did but the Alison they knew who was really Alisons twin named Courtney didnt.
noNo.
Alison is not writting them
Sasha Pieterse played Allison in Pretty Little Liars
No she did not
At church nit really
The real Ali discovered it.
No. A friend of Alison's.
No.
Yes, Allison got discovered in Pretty Little Liars
Alison dated Ian.
The real Alison did but the Alison they knew who was really Alisons twin named Courtney didnt.
Alison....
noNo.
Alison
NO!