released police surveillance video of this august shooting death, you see mary knowlton, the 73-year-old former librarian step in front of the crowd. it's her turn to play the victim. playing the bad guy is punta gorda police officer lee coel, who at this moment, has no idea that the gun he's holding is loaded with real bullets. this is supposed to be make-believe, a police training exercise for gun owners. but right here, when coel starts firing, knowlton falls to the ground. >> suddenly there were three loud gunshots. i caught her eye as she then went down onto the ground. >> reporter: the crowd in the police station parking lot isn't sure what's happening. police then rush to her side. officer cole lost his job and is fighting to get it back. he's also fighting charges, pleading not guilty to felony manslaughter. >> lee coel was not responsible for ms. knowlton's death. >> reporter: coel's lawyer says that a number of other people were responsible for making sure the gun wasn't really loaded. the police chief is facing a misdemeanor negligence charge,