The boxer was a character who appeared in Friday the 13th Part VIII: Jason Takes Manhattan.
He and Julius Gaw fight in a boxing match, but Julius defeats him when he's distracted by Eva Watanabe and Tamara Mason. He then goes to the sauna room and puts a towel over his face. Jason Voorhees enters, but he thinks that it's Julius. After the boxer speaks to him and gets no response, Jason grabs one of the hot sauna rocks and shoves it into his chest, killing him.