Wealthy farmer Adrian Prout has agreed to show police where his wife's body is buried after confessing to killing her nearly four years ago.
Prout, who is serving a life sentence for killing his wife Kate in 2007, has never revealed where he dumped her body and always denied having any involvement in her disappearance.
The farmer, from Redmarley, Gloucestershire, finally agreed on Friday to reveal the whereabouts of his wife's remains. He is to show Gloucestershire Police the exact location of Kate's corpse within the next hour.
Police said Redhill Farm, Prout's former home and the presumed burial site, will be sealed off while Prout shows detectives where he buried his wife's body.
Kate, a former teacher, disappeared the day after she asked her husband for an £800,000 divorce settlement. Prout reported his wife missing on 10 November, 2007 but police never found her body and the search was eventually suspended.
The 49-year-old was convicted by a jury at Bristol Crown Court after pleading not guilty to killing his wife. It is understood Prout confessed to his fiancee Debbie Garlick after he failed a lie detector test in prison.
Police confirmed they would carry out a detailed search of the farm next week but warned it was likely to last some time.
Detective Superintendent Simon Atkinson, of Gloucestershire Constabulary, said police had received "new and significant information" in relation to the murder of Kate.
"On Thursday afternoon two detectives paid a visit to the prison where Adrian Prout is being held.
"Adrian Prout has admitted to those detectives that he murdered Kate Prout - something which he had always denied - and has now suggested that he disposed of her body on Redhill Farm in Redmarley."
Since Prout's conviction, Garlick, who Prout has fathered a child with, has been campaigning to get his name cleared.
Prout's confession comes a year to the day after her relatives pleaded with him to reveal where he had hidden her body.