Boxer was a member of the E-Park Johnnies.
When the E-Park Johnnies made an effort to resurrect their "April Fool's parties", Boxer was one of the members present at Lops house, along with Mouser and Charlie. After drawing dominoes, they all set out to various points in Farmington with the intention to kill three random people in response to three gang members they had lost during that year.
That day, Boxer spotted Jeff Franklin sitting in a parked car with his daughter, Bonnie. Boxer approached the car from the side and, after yelling "Johnny says April Fool's!", he shot Jeff on the head killing him instantly. After fleeing the scene, he managed to hide the scene somewhere.
Later that night, Boxer was arrested and brought to the Barn as a suspect on the murder. Detective Dutch Wagenbach put him in a line-up for Bonnie to identify him. Then, Dutch questioned him and Boxer claimed that Mouser was the one responsible for the murder. However, when Mouser told Dutch the same and provided him with the evidence of the murder weapon, Boxer was charged for murder.