No. No one did. Her twin sister Courtney got killed because Courtney was pretending to be Ali. After Alison (Courtney) got in an argument with Spencer Alison got her revenge of killing Courtney.
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Mona. She is A.
it was not jenna it was Mona and it was because Mona tried to kill Spencer.
Mona, because she wanted to get revenge on the girls for how poorly they treated her, Toby because he wanted to protect Spencer, Spencer because she didn't want to be a victim of 'A' anymore, Ezra because he was writing a book about Ali, and Cece/ Charlotte/ Charles because she was pissed at the girls for being glad that Ali was gone.
Mona is A in the books AND the TV series. however in the books Mona falls of a cliff and dies, in the TV series Mona (A) got caught and put into a mental home. Mona was sending herself texts to make the girls think that Mona is being harrased aswell and would trust her!
it was Mona, but after she dies, a new A comes back. The new A is actually ALI. ali has a twin sister, Courtney. and she was the one that was killed. And it was actually Courtney that was friends with Spencer, Hannah, Emily, and aria. Courtney lived in a mental institute but tricked ali into going. so ali got revenge & killed her, pushing her down the hole. so ali became A to get back at the pretty little liars.