John Lennon's killer could recall at his parole board hearing this month that he had considered shooting Johnny Carson or Elizabeth Taylor instead, but he couldn't remember that he also thought about targeting Jacqueline Kennedy Onassis and others. The Sept. 7 interview at Attica prison in western New York, transcripts of which were released Thursday, was 55-year-old Mark David Chapman's sixth appearance before parole officials since he became eligible for release in 2000. In rare media interviews, Chapman has listed Onassis among potential targets but said in the parole interview he could recall only Carson and Taylor. Chapman was sentenced to 20 years to life in prison after firing five shots outside the Dakota apartment house on Dec. 8, 1980, hitting Lennon four times in front of his wife, Yoko Ono, and others. He pleaded guilty to second-degree murder. As he has said in the past, he told officials he chose Lennon because the ex-Beatle was more accessible. According to an interview printed in People magazine in 1987, other potential targets included Lennon's former bandmate Paul McCartney, actor George C. Scott, then-Hawaii Gov. George Ariyoshi and then