CLAYTON, Mo. (AP) — A jury has returned a guilty verdict against a 43-year-old man who testified he shot and killed a suburban St. Louis police officer because he was white.

St. Louis County prosecutor Bob McCulloch has said he plans to seek the death penalty against Todd Shepard for the killing of University City police Sgt. Michael King, who was shot on Halloween night 2008 while sitting in his squad car.

Earlier Thursday, Shepard testified he was motivated to seek out and kill a white officer. Shepard testified he is of mixed race but considers himself black. He described choosing King because he was white and vulnerable in the parked car with the window open.