Deadly Road Rage Incident in Southern California

Driver pleading not guilty to first-degree murder killing 39-year-old naval officer Zach Bube.
1:29 | 06/03/15

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Transcript for Deadly Road Rage Incident in Southern California
We have new images tonight of a deadly road rage incident in southern California. Watch the right-hand side of your screen. That is I-5 in San Diego, a car appears to be on the hunt, pursuing a motorcyclist. What happened just beforehand? ABC's Cecilia Vega tonight. Reporter: Rush hour on a southern California freeway. This is the moment just before the crash. Police call it a deadly case of road rage, saying the black car tailgates the motorcycle, then rams it from behind and runs over and kills 39-year-old Navy officer Zach. We're talking about something that went from a simple traffic violation to, you know, to a murder. Reporter: Driver Darla Jackson pleading not guilty to first degree murder. Records show Jackson's checkered history. A driver's license once suspended for lack of knowledge or skill, two ex-boyfriends filing restraining orders against her. One accusing Jackson of saying, "I'm going to run your expletive over with my car." In the last five years, 1,500 people injured or killed in road rage incidents across America. A reminder to all drivers, you never know who's in the car next to you. If convicted, Jackson faces 15 years to life. Tonight, there are families on both sides of this case grieving. All of this stemming from an argument that police say could have and should have been avoided. David? Cecilia, thank you.

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

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