One of the men convicted of murdering Sydney nurse Anita Cobby has died in jail.

One of NSW’s most notorious killers, convicted of murdering Sydney nurse Anita Cobby, has died in jail.

Michael Murphy, 66, was one of five men – including his brothers Leslie and Gary – found guilty of raping and killing the 26-year-old in a paddock in western Sydney in 1986.

He was sentenced to life without the possibility of parole.

A Corrective Services NSW spokeswoman confirmed Murphy died at Long Bay Hospital about 11.55pm on Thursday.

“The Corrective Services Investigation Unit, which is part of the NSW Police Force, is investigating and will prepare a report on the death,” she told AAP on Friday.

“All deaths in custody are subject to a coronial inquest, including deaths resulting from natural causes.”