AN estranged husband who shot dead his wife and her sister has died in prison after slashing his throat and body with a razor blade.
A Home Office inquiry was launched immediately after Stuart Horgan, of Plaistow, London, was found in his cell at Woodhill prison in Buckinghamshire shortly before 11.15am yesterday.
Horga, 39, had unpicked a disposable razor before using the blade to repeatedly cut himself.
He had not been on suicide watch since going to the prison five days after the killings.
Horgan is believed to have scaled a garden wall to force his way into the barbecue, in the village of Highmoor Cross, Oxfordshire, on June 6.
He sprayed bullets at his wife, Vicky, 27, and her 25-year-old sister Emma Walton as Mrs Horgan's daughter, Jade, seven, and the child they had together, Bobbie, three, watched.
Horgan's mother-in-law, Jacqueline Walton, 55, was wounded and is still seriously ill.
Horgan was arrested more than 100 miles away, in his family home in Peterborough.
He was later charged with two counts of murder and one of attempted murder and was due to attend court on August 13 to enter pleas.