Hivo Gonzalez, a rippled Miami model and boater, stopped for gas on his way to a Friday night of fishing.He wound up charged with murder.Prosecutors say Gonzalez, 32, got into an argument with a panhandler named Pedro Cruz at a gas station on the 500 block of Northwest 79th Street in June. Newly released surveillance shows that after the two exchanged words, Gonzalez returned to the cab of his pickup truck, retrieved a heavy fish bat and chased the panhandler down.Two blows struck the head of Cruz. He crumpled to the ground. He never got up.Cruz, 49, died a few days later at a Miami hospital. Gonzalez is facing a charge a second-degree murder. If the case goes to trial, Gonzalez, who has pleaded not guilty, would likely claim self-defense.Gonzalez’s defense lawyer says Cruz was repeatedly yelling threats because Gonzalez and his friend refused to hand over any money. He says Gonzalez didn’t know Cruz had been mortally wounded.