The vehicle did not remain at the scene at the time and fled the area, according to police.
Counties Manukau Police Detective Senior Sergeant Kepal Richards said the Operation Kinley team looking into the incident had identified a vehicle believed to be linked to Youn's death.
However, Richards hoped the public would play a part in understanding what happened by releasing an image of the man police believe can assist their investigation.
"While we recognise the image is not high quality, we would ask anyone with information to come forward to police," he said.
"You contact the Operation Kinley team on 09 261 1321 any time."