no, ian did not kill ali. this is what happened: ali has a twin sister courtney. but courtney liked to pretend she was alison. so her parents sent her to a mental institution. but when courtney came início for the summer, she pretended she was ali, & her parents thought that ali was courtney & sent ali to the mental institution. so the whole time, courtney was really ali. during their sleepover, when courtney left spencer's barn, ali pushed courtney into the whole & killed courtney. & ali is the new A after mona died.
Nope it is not ian. this seguinte part is a SPOILER so ifyou do not want to no don't keep reading!!!!!!!!!!!!!!!! From a fonte on facebook apperently its mona im in the middle of the book series so it ruined it for me but it's ok! :)
Don't think Ian did it at all. he could have been framed por A and again it would have just been too easy if he did do it and seemed like it made sense that did it because evidence was pointing to him at the time but again it would just be too easy to assume that..