Dmitriy Popov was 17 when he fatally stabbed the gay professional dancer during a confrontation at a Brooklyn gas station.
Police say the man shouted anti-gay slurs before allegedly whipping the boy with a belt near a Manhattan playground.
A New York jury convicted Dmitriy Popov of first-degree manslaughter as a hate crime, but acquitted him of second-degree murder.
Joss, who voiced John Redcorn, was allegedly shot by a neighbor after years of threats and anti-gay harassment, according to his husband.