Of Lennon, Time, Loss And Parole
Article discusses possibility of parole for Mark David Chapman, who killed Beatle John Lennon 20 years ago; Chapman says in interviews that he could not kill again; article notes that only 5.6 percent of murderers making their first parole board appearance are released; Lennon's wife, Yoko Ono, has written to parole board, though content of her letter has not been made public; officially, public opinion should not be consideration, but article maintains it is difficult to ignore, as millions grieved Lennon's death (M)