Bedfordshire Police have offered a £10,000 reward in the hunt for the killers of a Kempston pensioner.
Turkish-born Sharif Demirsay, 65, was stabbed to death in front of his partner after being attacked by three robbers in the hallway of their bungalow.
Mr Demirsay's 68-year-old partner was hurt as she tried to fight off the men who had got into their home in Vineyard Way on May 14 this year.
They stabbed him multiple times. As he lay dying in the hallway the attackers demanded money and jewellery form his partner, who was also stabbed and needed surgery.
£1,000 cash and gold jewellery was taken.
Police are still searching for the murder weapons - believed to be kitchen knives - that could have been discarded in hedgerows or gardens by the killers as they left the scene.
CCTV shows them approaching the house at 9.32. Three minutes later the same men run back the way they came.
Four people have been arrested and bailed by the police. They are aged, 17, 18, 19 and 24.