THE parents of suspected murder victim Christopher Dean Watkins believe their son was killed by a feared psychopath.
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Launceston police Detective Inspector John King said on Friday that police were now zoning in on six unnamed individuals who they believe know what happened to Mr Watkins on the night of his disappearance.
Mr Watkins vanished after an incident with a number of men at a Box Street unit at Mayfield on August 7, 2013.
Police have confirmed Mr Watkins made a desperate phone call to his family for help, but his family and a friend were unable to stop what happened.
Their two-year investigation suggests two people known to Mr Watkins went to the unit, frightened him, and the events that followed led to his death.
Mr Watkins' mother Lillian Watkins said on Friday that she believed "four or five" men witnessed the events unfold.
Mrs Watkins said at least one of the men entered the home, likely attacked Mr Watkins from behind, placed his unconscious body in a car, before shooting him in bushland somewhere in the North.
Police have not confirmed this.
Mr Watkins' parents believe their son's killer was a calculated criminal known to police.
They said they "wouldn't be surprised if he was in the bushes with a gun right now, watching them".
Mrs Watkins admitted to digging for her son's body in the Rocherlea area in April 2014, after speaking with a psychic.
She also claimed her son's killer had threatened her family via a false Facebook account.
Mr Watkins' father, who did not want to be named, said he was now confident his son's suspected murderer would be brought to justice, after police announced a $50,000 reward on Friday for information leading to prosecution.
"He will be caught eventually. It's just a matter of time," Mr Watkins' father said.
"He will slip up."
Mr Watkins' parents believe their son and his killer did time together at Risdon Prison and Mr Watkins taunted his eventual attacker through a fence almost daily.
They believe the taunts may have been a motive for Mr Watkins' death.
Detective Inspector King urged the six witnesses to "rethink" what they had previously told police.
"Those men provided statements to police - some of them have provided multiple statements to police," he said.
"We're now in a position to indicate that the evidence available to us (shows) some of these people have been deliberately misleading our investigation and in fact lied to police.
"We'd like to think the reward ... will prompt these people to reassess the information provided to police and also may prompt other people who haven't spoken to us to give us any new information that they may have."