Roberts says his first selfish thoughts at the time were of how the case - revealing his sexuality - would "destroy" his career.
"This is what I live with now," Roberts told Peter Sterling in an emotional interview on Fox Sports.
"And I don't ask for anyone's sympathy or (have) regrets because I'm totally comfortable with what happened now. I can totally get my head around it.
"But for me to go to that point and think about my career when that boy ended up being murdered, left dead in a ditch, it kills, it crushes me."
Roberts says his coming out in 1994 - which he described as the "worst-kept secret in rugby league" - was a huge relief personally and for his family.
Beforehand, he said his mother and father had stopped going to games because of the abuse their son copped from the crowd.
"My parents never wanted me to come out either but I think it was to their relief too and they understood then why I had to come out," Roberts said.
"It almost gave them the right to be there and stand up for me."
- AAP