KNOXVILLE, Tenn. (AP) — Jurors are set to begin deliberations in a murder trial involving the 2015 death of a Tennessee teenager who shielded friends from gunfire and was posthumously hailed as a hero by then-President Barack Obama. Prosecutors and defense lawyers gave their closing arguments Wednesday afternoon in the trial of Christopher Drone Bassett, 22; Kipling Deshawn Colbert, 22; and Richard Gregory Williams III, 23. All three face first-degree murder charges in connection with the death of 15-year-old Zaevion Dobson.