Hair-Trigger Murder Trials

Two terrible tragedies over simple disputes turn deadly in Florida.
3:00 | 02/08/14

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Transcript for Hair-Trigger Murder Trials
Now to another national case tonight of a split second decision turning into family tragedy and coming after that case playing out at a movie theater. The young father texting. The retired police captain pulling the trigger after a confrontation in the theater. Now comes yet another case. This time a gas station a driver asking the people of the other car to turn their music down. Moments later the scene turns deadly. Reporter: They're the split second decisions that can change and end lives. The 17-year-old Florida teen shot and killed after an argument over loud music in a gas station parking lot. His accused murderer Michael Dunn standing trial 16 months after Jordan Davis' death. The teenager's mother wiping away tears. I turned the music down. What did Jordan Davis say. Turn the music back up. Reporter: Moments later shots fired. The friends say that never happened the detective at the scene saying at court. I did not see any type of weapons. This just a day after we showed you that surveillance video capturing another split second decision when a 71-year-old retired detective shot and killed a man in a movie theater after a confrontation over texting. Watch as infrared video showing Curtis reeves asking Chad Olsen to turn off his cell phone. Reeves leans over again and again. Then gets up to talk to the manager. Olson grabs reeves popcorn throws it at him and reeves grabs his gun and shoots. Reeves saying this in a police interview. It scared the hell out of me. Reporter: He said if it happened all over again, he would have just moved. Reeves and Dunn have pleaded not guilty gio Benitez ABC news, new York.

This transcript has been automatically generated and may not be 100% accurate.

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