Simon Crisp was putting rubbish in bins out the back of a pub on Tasmania's remote west coast when he was fatally shot.
Ten years since his murder in the early hours of July 13, 2013, police have launched a renewed call for information.
Investigators at the time said Mr Crisp, 44, was the victim of a "premeditated and callous" act by a killer who waited in hiding at the Marrawah Tavern.
His partner, who worked at the pub, and daughter were inside the hotel during the shooting.
Tasmania Police Detective Inspector Steve Jones said the investigation remained open and ongoing, and "it will remain so until the matter is resolved and the person or people responsible are brought before the court".
"To date, hundreds of people have been spoken to by investigators and a significant number discounted as to their involvement," he said on Wednesday.
"However, there remains a small number of persons of interest."
Insp Jones said police believe there are people in the community who have crucial information about the night in question.
He said police are confident with the passing of time, changes in personal circumstances will enable someone to "provide the information required to close this case and provide answers for Simon’s family and friends".
A reward of up to $500,000 is on offer for information that leads to a prosecution.
Anyone with information has been urged to contact the Burnie Police Station or Crime Stoppers Tasmania, and can report anonymously.
