so wait...
you said a cyclist killed him, and you're a cyclist...
you also said he was a drinker and extremely bent out of shape about not being allowed to drive...
but i don't understand... did not driving make him kill himself/lose the will to live? did he drink himself to death?
or did you kill him?
i don't understand, it sounds like you're very sensible and cared a great deal for him, so i don't actually think you killed him, but it sure sounded like it!