After his 1981 manslaughter conviction, Spengler was given an indeterminate sentence, said Monroe County District Attorney Sandra Doorley.

CNN: STORY HIGHLIGHTS

He was given an indeterminate sentence of imprisonment for public protection when he was sentenced on Friday, 27 February.

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Betteridge's three-year minimum term in his indeterminate sentence came to an end in December 2008 without a Parole Board review having taken place.

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But the court heard that a procedural error had been made during sentencing, meaning Macdonald did not meet the criteria for an indeterminate sentence.

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Farndon was serving an indeterminate sentence for public protection after fracturing a victim's skull in a hammer attack, and his escape sparked a nationwide manhunt.

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Owen was given an indeterminate sentence with a minimum term of three years but he later challenged this and was given a six-year jail term instead.

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At an earlier hearing, he was given an indeterminate sentence for a minimum of six years for the latest crime, to run concurrently with his life sentence.

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Prisoners can be given an indeterminate sentence for public protection.

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It will be a indeterminate sentence.

BBC: Stuart Kuttner, Managing Editor, News of the World