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.