I don't know---I think this from the HELP note is very concerning:
'Today is your birthday but you aren't here and I am so sorry for that. I'm sorry that you couldn't have a chance at life you should have & for the pain that your parents must experience every day. We tried our best but it wasn't enough. I can't do it any more. I don't know if anyone will think of you today or any day but I do. I hope....always remember, because you should be. I can't do this any more. I want someone to help me but they can't so what is the point in asking. Hate my life.
If the bolded portion was not there, it could be interpreted more innocently. But the bolded seems like another confession type note, imo.