LEAVENWORTH, Kan. (AP) — A Kansas man has pleaded no contest to second-degree murder for the shooting death last year of a 12-year-old boy outside a Leavenworth pharmacy. Darvon Deshawn Thomas, 26, of Leavenworth, entered the plea Tuesday in Leavenworth County District Court, admitting to his role in the April death of 12-year-old Brian Henderson, of Kansas City, Missouri, the Kansas City Star reported .