Police investigating death of John Mansfield, serving life for murdering woman in 2006, at Cambridgeshire jail
A prisoner has been arrested on suspicion of murdering a convicted killer at a high-security prison.
John Mansfield, who was jailed for life in 2007 for the murder of his 63-year-old neighbour, was found dead at HMP Whitemoor near March, Cambridgeshire, on Sunday.
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