Hannisha Willis, 31, of Antioch, California, was shot and killed on December 27, 2022, after an altercation outside her home on Mandarin Way. Police found Willis on the front lawn with a gunshot wound to the head; she was pronounced dead at the scene.

The confrontation involved Willis and her next-door neighbor, Serico Justice, and grew out of a reported love triangle with a man who had been seeing both women. Justice told officers the pair argued, that Willis punched her, and that during a struggle a gun she was carrying discharged. Justice later was arrested and charged with murder.

The investigation was complicated by internal problems at the Antioch Police Department after revelations about officers exchanging racist, homophobic, and sexist text messages, and one detective was placed on administrative leave. If anyone saw the events on Mandarin Way that day or has information about the relationships involved, please share what is known.