Mark David Chapman shot and killed musician John Lennon
December 8, 1980, outside the Dakota Apartments in New York City. Mark David Chapman was a former security guard from Hawaii who came to New York specifically to attack the famous ex-Beatle. He waited outside the Dakota, then shot John Lennon with a snub-nosed revolver as Lennon was returning with his wife, Yoko Ono
, from a late-night recording session. Chapman made no attempt to flee and was arrested on the spot. Though Chapman's lawyer initially entered a plea of insanity, Chapman later changed the plea to guilty. He was sentenced to 20 years to life in prison, a sentence which he began serving in New York's Attica prison. Mark David Chapman became eligible for parole in 2000, but was denied parole that year -- and has been denied parole again every two years since then.