Who killed Toby in the series Pretty Little Liars?

Answer 1

Toby does die in the book series. No one kills Toby in the book series. It was suicide in the book he overdosed on pills. He is found dead behind Emily Fields's house. Emily finds a note which contained the truth of 'The Jenna Thing'. Spencer tells the other girls the truth: Toby abused his stepsister and Toby promised to keep a secret for Alison if she did the same for him. Thinking Emily knew the whole truth, he commits suicide. Toby commits suicide for a reason. He mentions in his note to Emily "he couldn't live with the mistake he has made." One mistake was abusing his sister.