Mullin was driving alone when he drove past Perez who was weeding his lawn. For no apparent reason Mullin made a U-turn, stopped his station wagon and laid his rifle across the hood to aim, killing Perez instantly. Then he got back into his car and 'calmly' drove off. It was broad daylight and there were a number of witnesses, one of whom gave police the license plate number. A 'docile' Mullin was captured a few minutes later.