Detective Extralarge: Yo-yo (1991)

Burt meets Jack Costello after many years. Burt is a boxer and he is fleeing after a fixed match that he should have lost but instead he won. Then he vanishes. Costello finds in his office Burt's son, 'jo jo' Ritchie, who had came because his father had ordered him to go to him. Then Jo Jo cames back to Groggy where he lives and when the two of them are dining, two men arrive and kill Groggy. Jo Jo runs away and Extralarge sets on finding him and his father.