According to witnesses, Strother somehow managed to overpower Bardes before mounting him and repeatedly punching him in the middle of a road near Fort Myers.
Footage released Thursday shows Russell drop his weapon and calmly walk away from the scene.
Russell later told investigators that while Bardes was begging him to shoot Strother, he initially commanded the 53-year-old to get off of the policeman.
Witness video of a Good Samaritan shooting Edward Strother late last year.
When Strother refused to move, Russell squeezed off three rounds, hitting his target in the neck and shoulder as dozens looked on. The incident was filmed from multiple angles.
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GRAPHIC: Bystander shoots Edward Strother dead
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Russell, who had a license to carry a handgun, wasn’t charged after the shooting was determined to be justified.
Video of an armed Good Samaritan rescuing a Florida deputy has been released four months after the stunning incident was caught on camera.
Strother was pronounced dead at hospital.
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He receives a pat on the shoulder from one witness while another appears to applaud as additional law enforcement officer arrived.
When Ashad Russell saw Lee County officer Dean Bardes being pummeled by a man last November, the bystander pulled his gun and pointed it at Edward Strother, who’d just led Bardes on a high-speed chase.