But police say there are missing pieces of the puzzle immediately before he was struck. It's possible he was in a vehicle at some stage.
They have appealed to the public for help through the media, even releasing security camera footage in a bid to refresh people's memories of Mr Jack at the Caltex service station shortly before he was found dead.
Sadly police have only received limited information so far from the public.
Come on Rotorua. Someone out there knows something and they're choosing not to speak up. For whatever reason, it's wrong. Police have methods of receiving information from the public anonymously. There is no excuse for staying silent.
Information can be passed on by calling 0800 555 111 anonymously or by ringing Rotorua police on (07) 348 0099.