Former Tampa police officer Curtis Reeves is on trial for the 2014 shooting death of Chad Oulson at a movie theater. Investigators say the men got into an argument when Reeves confronted Oulson about using his cellphone. Surveillance video shows Oulson grab Reeves’ popcorn and throw it at him. Reeves then fires a gun, fatally wounding Oulson. Reeves is charged with second-degree murder and aggravated battery. He has pleaded not guilty, claiming self-defense.