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just a couple of hours ago, police released surveillance video of a deadly shooting involving an officer and a suspect who kidnapped a woman in the trunk of his car. tonight, police say the video is an example of how officers sometimes have to use deadly force to save their lives. jeremy jojola is live in the newsroom with a look at that video. jeremy. a warning tonight for our viewers---this video may be disturbing for some of you. it's from a gas station camera capturing a suspect with a knife who attacked an officer. that officer quickly shot the suspect. this is surveillance video captured at the flying-j truck stop this past june. in the grey car, a suspect named julian calbert----a woman is with him.... and in the trunk of the car---another woman he kidnapped---she called police from a cell phone. officer aaron zwicky arrives---and orders the suspect to open the trunk of the car. his attention is drawn by the other woman---when suddenly calbert lunges at the officer's face with a knife. in split seconds, officer zwicky fires his gun several times killing calbert. this video was reviewed by the grand jury. the shooting was ruled as justified. "you can always try to tell people the event events happen quickly and people think there was another option. you could have changed your behavior. you could have had a different reaction. this is a perfect example of what we have to deal with and very often we don't have that opportunity." "we don't want to use deadly force ...