Hmmmmmmm, I feel very sad and speechless right now. I know how it feels to commit suicide. I've had those crazy thoughts before but i never let the bullshit get past me.
I just picked myself up and tried to understand that life is not fair and things can't always have it's way the way we expect. I really feel for your friend and hope he survives this tragic event hale and hearty. I do hope you are not letting this weigh you or affect you and your mental health in any way possible. Don't blame yourself for not being able to help him, You had no control over him It's so evident his mind must have really been controlled by the illicit cocaine drug he has been taking.

Relax, it can get better. Regardless of what happens Life goes on. Am i right?