Most of all I suspected Alice, she was creepy as fuck and spoke about Jason as if he was the worst person who ever lived.

I suspected Hal, Polly and Clifford. I also considered Fred, Ethel and Cheryl.

I have all those (but yeah Jughead and Grundy only for a short while)

I agree completely about Alice; when I first watched the show, and hear her speak for the first time, I wanted to go back and have subs on, because I couldn't believe what I just heard that she said about a person being murdered "If he is dead, I hope in his last moments he suffered, may Jason Blossom burn in hell"

Honestly also that creepy scene you showed where she laughs, she talks and acts as if she was the devil in human form, and that scene where she was laughing, I honestly thought she would confess that SHE was the killer.

But I also had Penelope for a very short time (But I'm glad it wasn't her, that would actually have made me mad)

I definitely didn't consider Cheryl; She was one of only the characters I was most certain had nothing to do with it; Because I'm sorry, it makes absolutely no sense at all, that she herself would ruin her life by killing the only person who was always there for her, and who she loved so much, I don't get people who think it was because Cheryl loved Jason in a romantic way and then Jason thought that was weird, so she killed him; that's just stupid, and if she wanted him in a romantic way (and was insane) she would go after the person who was in the way NOT the person she herself loved. And I would have been super pissed if she was the killer, that would have made her the worst character, and the biggest faker in history. I get some people want it to be really shocking, but there is a limit, it should also be realistic and the people who loved him the most killing him, doesn't.

Also that Dilton Doiley guy.