Keith Richard will live to be 100, he survived Anita Pallenberg. I read a roadie's biography of the Stones that covered the band's inception to the 80's, she was something else. Don Henley wrote a song about her.
Mark David Chapman has been eligible for parole every two years since 2000, he's been rejected every time. Paul McCartney and John Lennon reconciled in 1977, after that it was only a matter of time before another Beatles album was made.