The hustler bus driver who inspired seemingly everyone who had a public voice in the Beat scene, 1960's, predictably, didn't have the patience to finish his own autobiography. So many authors, such as Kerouac perhaps, are thieves of other people's lives.
I'd say Cassady (I think his name is misspelled here) was like the little brother you never had, but poorer, manic and more exposed. Read Kesey's essay, The Death of Superman for a look at how it ended.