Detectives are hunting a missing neighbour of a former miner who was murdered near his home.
Robert Boyer went missing from his home two weeks ago
The body of Keith Frogson was found on the doorstep of his home in Annesley Woodhouse, Nottinghamshire, following an apparently unprovoked attack.
Police want to trace 42-year-old Robert Kelvin Boyer, who went missing after the killing two weeks ago.
Mr Frogson died in a frenzied attack in Bentinck Street after a night at his local pub on 19 July.
A post-mortem examination found more than one sharp instrument was used in the assault.
Police said a crossbow found near the scene could have been the murder weapon.
Mr Frogson's son, Wayne, has asked the local community to come forward with information, saying the family believed his father's killers were being shielded.
Det Ch Insp Russell Foster, of Nottinghamshire Police, said: "There are concerns for the safety of Robert Boyer and we need to find him as quickly as possible.
Keith Frogson died from head injuries
"I would ask the public not to approach him but to contact the police on 999 if they see him.
"We want to speak to Robert Boyer in connection with the murder of Keith Frogson and we urgently need to hear from anyone who knows him or who has spoken to him recently."
Mr Boyer is described as white, about 5ft 9in and of slim build.
Police said he usually wears a baseball cap and dark clothing and may have a shaved head or very short hair.
A 37-year-old woman and an 18-year-old man have been arrested in connection with the murder and released on police bail pending further inquiries.