Israel Jack Rotorua police are treating as suspicious the death of Israel Jack, who was run over while walking home on Te Ngae Rd early on August 18.
They say at least two vehicles struck him as he lay on the road.
What is unknown is why he was lying there, how he managed to travel 1.4km in about five minutes during the last leg of his walk from town, and why his cap was found about 400m from where his body lay.
Detective Senior Sergeant Zane Smith said police were looking into suggestions that Mr Jack was picked up in a vehicle and might have been subjected to foul play before being left on the road.
"We are not going to just determine this was a road accident and move on. Mr Jack's family deserve to know what happened that morning and we will continue to dig until we find some satisfactory answers."