Detectives investigating the murder of Sharif Demirsay have re-arrested three people in connection with the killing.
Mr Demirsay, 65, from Kempston in Bedfordshire was stabbed to death at his home in May.
Bedfordshire Police say the all three people have been previously arrested and have been on police bail while enquiries continued.
The suspects are aged 15, 17, and 19. The Crown Prosecution Service authorised their re-arrest on the basis of further evidence.
A £10,000 reward is still available for information leading to the arrest and conviction of the offenders.
Anyone with information is urged to contact the Bedfordhsire, Cambridgeshire and Herts Major Crime Unit on 01480 422791.
Police have said the "jigsaw is coming together" in the hunt for the killers of a grandfather from Kempston in Bedfordshire.
Police have renewed their appeal for information over the death of a grandfather from Bedfordshire.
It's three months today since Sharif Demirsay, who was 65, was stabbed to death in front of his partner in Kempston in May.
A £10,000 reward has been offered by police investigating the murder of a pensioner in his flat in Bedfordshire.
Sharif Demirsay was stabbed to death at his home in Kempston near Bedford in May. Today his grand-daughter also made an appeal for help in catching his killers.
Nina Gill, the granddaughter of murder victim Sharif Demirsay, says the reward is designed to help get justice for her granddad.
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.
The granddaughter of a man stabbed to death in his own home in Bedfordshire has made an emotional plea for information about her grandfather's murder. Sharif Demirsay was brutally killed in front of his partner in Kempston two weeks ago.
In a press conference this afternoon Nina Gill described him as a truly adored man. Elodie Harper reports.
Detectives investigating the murder of Kempston man, Sharif Demirsay, are looking into a car fire in Corby Close yesterday morning to establish any connection.
It was was deliberately started by a man who was seen to smash the window of the blue BMW and pour accelerant into it.
Turkish-born Sharif, 65, was killed in his home at Vineyard Way on 14 May at about 9.30pm, when three offenders knocked at his door and when he opened it, they stabbed him to death in front of his partner.
Det Insp Richard Wall of the Beds, Cambs and Herts Major Crime Unit said: "We are investigating whether there is a link between this car fire and the murder.
"We are moving ever closer to establish who killed this man and why and we will be relentless in our pursuit of those responsible."
Detectives investigating the murder of a man in Bedfordshire are appealing to the public to help them catch his killers.
65-year-old Sharif Demirsay was stabbed to death in front of his partner, at his home in Vineyard Way in Kempston last Tuesday evening.
A week on the police say they believe he may have been targetted, but they don't know why.
View Olivia Paterson's report...