Killer's death in prison was caused by head injury

John Mansfield was jailed for a minimum of 30 years after pleading guilty to murder in 2007

A convicted murderer found dead in prison died from a head injury, a post-mortem examination has concluded.

The body of John Mansfield, 63, was discovered at HMP Whitemoor, near March in Cambridgeshire on Sunday afternoon.

Police said a 44-year-old inmate arrested on suspicion of murder remained under investigation.

Mansfield was serving a life sentence for the 2006 murder of his 63-year-old neighbour Ann Alfanso at her flat in Whalley Range, Manchester.

A Cambridgeshire Police spokesperson said: "A murder investigation continues after a man was attacked at HMP Whitemoor on Sunday, 13 April.

"Initial findings from a post-mortem conducted at Addenbrooke's Hospital yesterday (16 April) concluded Mr Mansfield died as a result of a head injury."

Mansfield, formerly from Manchester, was pronounced dead at the prison at 16:27 BST.

He was jailed for a minimum of 30 years in 2007 after pleading guilty to murdering Ms Alfanso.

She had reduced mobility and was found stabbed about 20 times in the head and neck in August 2006.

In 2014, Mansfield was given a second life term after stabbing another prisoner with a broken plate at HMP Full Sutton, near York.