Servin, an off-duty police officer, drove his car to Douglas Park on the West Side of Chicago after calling the police to make a noise complaint. He then approached a group of four individuals who had been partying in the park and had some form of verbal altercation with them. Reports are unclear as to whether Servin was calm and polite or rude and aggressive. One of the victims, Antonio Cross, accused Servin of attempting to buy drugs from the group, to which Cross allegedly told Servin to get his "crackhead ass" out of there.

Servin fired on the group, hitting Rekia Boyd in the head, and Antonio Cross in the hand. Initially the Chicago police department claimed that Servin had discharged his weapon after Cross had approached him with a gun. The Boyd family quickly responded that the object was in fact a cell phone. No weapon was ever recovered from the scene.

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