Police are calling for the co-operation of the Tribesmen motorcycle gang, as the investigation into the death of a young prospect continues.

On February 21 2016, Clayton Ratima, 24, as admitted to Middlemore Hospital with injuries consistent with having been severely assaulted.

He died three days later.

Detective Senior Sergeant Albie Alexander said detectives investigating Ratima's death have information that he was assaulted at the Tribesmen Motorcycle Gang headquarters in Berrit Place, Otara, during the early hours of February 21.

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The Tribesmen headquarters has now been vacated by the gang, seemingly after this incident occurred.

"Significant progress has been made in the investigation to date, with a number of the gang's members and associates giving police invaluable information.

"However, we still believe there is further information being actively suppressed by the gang," Alexander said.

"We know that there are people within the Tribesmen gang who know what happened on that day and police are as determined today as they were seven months ago to resolve this investigation and seek some resolution for Mr Ratima's family and friends."

Anybody with any information is urged to contact Albie Alexander on 09 261 1300, alternatively, they can contact Crimestoppers anonymously on 0800 555 11.