He acknowledged the dedication and hard work of the investigation team who had worked tirelessly on the investigation.
Last month, police turned to the public for help to find three mystery people seen pulling up at a downtown Auckland petrol station in a van three hours after Youn was seen fatally tumbling from it on April 28.
After finding the vehicle that Youn fell from, a silver Toyota Alphard, police shared security footage from a petrol station forecourt where those inside the van stopped to refuel later that night.
Police hoped someone would recognise the people or be able to provide more information about the van's movements that night, and help crack a homicide case that has left Youn's family with many questions.
Counties Manukau detective sergeant Robert Kerr said the dead man's family was still grieving after making the difficult decision to turn off his life support.