I heard on tv that the victim's father killed one of his other sons and was charged with manslaughter. They also said the victim had a history of spousal abuse.
I'm not sure about the accused, but supposedly he had a charge of assaulting a police office, but it was dismissed.
I was prepared to be against the bigger guy, but after hearing some of the case, I think it may have been self-defense.
If the circunstances were that the death happened in the first fight, self defense could better be applied. The amount of force to the threat level would still be in question, but I bet consideration then would have been less.
If Junta had tried to make a wide loop to avoid Costin in order to get to the locker room, self defense then prevails.