The parole hearing scheduled this week for former Beatle John Lennon's killer Mark David Chapman has been postponed in New York, sources told Sky News.

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Next month's session will mark the sixth time Chapman, who pleaded guilty to fatally shooting Lennon in 1980, will campaign for his release from the maximum-security Attica prison in upstate New York.

His five previous bids for freedom have been denied since he became eligible to apply for parole in 2000.

Yoko Ono, the wife of the slain musician, has consistently opposed Chapman's release, stating she feels Chapman could be a danger to her and her family, Sky News noted.

Chapman was sentenced to 20 years to life in prison for his crime. He reportedly has demonstrated good behavior in prison and apologized for the actions that led to his being there.