Joseph Slaten, 49, of Desert Hot Springs was shot and killed on February 14, 2018. He was found around 5:30 p.m. in a parked car near a home on Avenida Alta Loma; a woman with him suffered non-life-threatening gunshot wounds and survived. Officers had been en route after receiving reports of an argument and pronounced Slaten dead at the scene.

Investigators identified 39-year-old Anthony Webb of San Pedro as the primary suspect. Webb was arrested in late February after barricading himself during an attempted Riverside County Gang Impact Team arrest; a Los Angeles police SWAT unit took over the operation. Webb was charged with murder and attempted murder and ordered to stand trial. He was later found unresponsive and pronounced dead in his jail cell at the Cois Byrd Detention Center in Murrieta; authorities said no foul play was suspected.

What information might explain the motive or sequence of events leading up to the shooting, and did anyone hear or see activity near Avenida Alta Loma that afternoon?