Detectives believe he was killed after a drugs deal went wrong.
Detectives believe the theft may have taken place some time ago, he said.
Detectives believe he died overnight between 21 and 22 January 2009.
Detectives believe Michael and two friends were chased from a car park through the streets of the town before the attack.
The Detective believes a mass murderer has come to town.
Detectives now believe that the robbery was committed with the help of someone working in the bank.
Some of this blood, detectives had long believed, came from her attacker.
But detectives, interviewing witnesses and family members, believed the death was over drugs.
Detectives do not believe there is any connection between the two robberies.
Detectives believe they may hold a vital clue to the killer.