"After 28 years we are asking the government to post a reward, asking the police to fully investigate what happened to our boy, my nephew," an emotional Craigie told BuzzFeed News in Tamworth.
Mark Haines was 17-years-old when he was found dead in January 1988 on railway tracks outside of the regional city of Tamworth in north-western New South Wales.
Haines had said goodbye to his girlfriend at around 3:30am, a train driver discovered his body on the tracks hours later.
Despite massive head trauma, there was only a spot of blood the size of a 50 cent piece at the scene and a stolen car was found nearby.
The death was ruled suspicious and two subsequent coronial inquests returned open findings, failing to identify what caused Haines' injuries.
In 2001, a witness came forward saying she had seen a group of men earlier that night around the stolen car.
This led police to reopen the investigation, but despite their appeals for information, no one has come forward.
The death remains a cold case and Haines' family has always maintained that he was murdered.