okay..well based on your criteria, joey ramone cannot be the most rock & roll person ever. he died from lymphatic cancer. that is not rock & roll. the only truly acceptable rock & roll ways to die are: overdose, cirrhosis, lung cancer, aids, heart attack (under certain circumstances), and other similar ailments.
that being said, i am changing my answer to:
jimi hendrix.
he died by choking on his own vomit. it doesn't get more rock & roll than that.