Police are investigating the death of a man in hospital following his arrest overnight.
Auckland City District Commander Superintendent Karyn Malthus said the man went to Auckland Hospital earlier in the day for some treatment and was then discharged.
At that point he was arrested by police at the hospital just before 6pm and taken to the Auckland Custody Unit.
Shortly after midnight, the man was found unresponsive by police.
An ambulance was called and police provided first aid including performing CPR, however, the man died in hospital a short time later.
Superintendent Malthus said his family have been notified and police are providing support.
Health officials have also joined the investigation into the man's death, she said.
The matter has been reported to the Coroner, WorkSafe and the Independent Police Conduct Authority.