Six months to the day since Paul Foster was shot dead in Luton, police are offering a £10,000 reward to help catch his killer.
The 46-year-old died at Brunel Road in Lewsey Farm as he left a friend's home on April 9.
Three people have been arrested on suspicion of murder, interviewed, and released - but no-one has been charged yet.
Det Supt Paul Fullwood said: "We know there are people living locally who can solve this case and we hope the offer of cash will encourage them to do the right thing and come forward and speak to police.
"[Paul's] death has left a family in despair. Three children have lost their father and a wife her husband."
More top news
A father from Norwich is speaking out after his six-year-old son was left without any formal education, after being excluded from school.
A man from Hertfordshire is fighting for justice after his wife was shot in front of their young children in the Philippines.
A coroner has criticised the Luton and Dunstable Hospital after the death of a 10-month-old boy from a rare bowel condition.