THE family of murdered Campbell Town man Shane Barker have vowed to fight on for the restoration of the cold case unit even if Mr Barker's killer is found.

Mr Barker was found dead in his Campbell Town home on August 2, 2009.

The well-liked 36-year-old father had been shot several times in the back.

Three years on, his family is still searching for answers.

``I just want to know why,'' his brother Paul Barker said.

``It's three years down the track and they are still no closer to finding a suspect.''

Shane Barker's death is the most recent of Tasmania's unsolved murder cases, which includes the 1995 case of Italian tourist Victoria Cafasso and the 1996 murder of Paul Byrne, at Rossarden.

Shane's murder is being investigated by a dedicated team within Northern CIB, but Mr Barker believes it was next in line for the attentions of the cold case unit before it was disbanded in December last year.

``We were hoping that the case would be solved before it got to the cold case unit, but we always knew that was there for back-up,'' Mr Barker said.

He said that it was ``gut-wrenching'' to think that the hunt for Shane's killer could be stymied by a lack of resources.

``It's not the police's fault, they just don't have the time,'' Mr Barker said.

``The longer it goes on, the less chance it's ever going to have of getting solved.''

Assistant police Commissioner Donna Adams said that investigating Shane Barker's murder remained a priority for Northern CIB.

``It is understandably of significant concern to Mr Barker's family that his death remains unresolved,'' Ms Adams said.

Police offered a $50,000 reward in November last year for information on Shane Barker's murder.

Ms Adams said that there were no plans to increase the reward at this stage but it could be increased in the future.

Police Minister David O'Byrne said that crime rates in Tasmania were at record lows and the investigation of long running cases ``continued as normal''.

He said that the potential reinstatement of the cold case unit was an operational issue for police.

Mr Barker said that bringing peace and justice to the families of murder victims was more important than the budget bottom line.

``Even if my brother's case is solved, I would still be a person who would try to keep the cold case unit going for other families,'' he said.

``We are just waiting for the phone to ring or the knock on the door from the police to say they have got the killer.

``It's what I dream about all the time.''

Anyone with information about Shane Barker's murder can contact Crime Stoppers anonymously on 1800 333 000.