Vic Reynolds, director of the Georgia Bureau of Investigations, on Friday said that William Bryan was arrested Thursday evening and charged with felony murder and attempt to commit false imprisonment of the unarmed black jogger Ahmaud Arbery in the Feb.
Bryan has previously come forward as the man who recorded a video of the slaying and turned the footage over to investigators before it emerged on social media and went viral earlier this month.
The video shows Aubrey jogging down a two-lane street in a suburban neighborhood in Georgia, then being shot to death as he was confronted by two armed white men who had stopped their pickup truck in his path.
The footage stoked outrage from civil rights activists already pointing to the case - with no arrests 10 weeks after the fact - as the latest incident of law enforcement in the United States allowing white perpetrators to go unpunished in the unjustified killing of a black man.
Days later, after the GBI intervened, police arrested the two white men seen in the video - former police officer George McMichael, 64, and his son Travis McMichael, 34.
Each was charged with aggravated assault and felony murder.
The McMichaels told police they suspected Arbery in a string of neighborhood burglaries when they spotted him running down the street and gave chase in their pickup through the coastal, south Georgia town of Brunswick, seeking to make a citizen's arrest.
Bryan's attorney has said to the media that his client had no relationship to the McMichaels and told police he was a mere bystander to the confrontation.
Arbery's relatives have said they believe Bryan, too, had taken part in the fatal pursuit.
Authorities have not explained any circumstances of Bryan's suspected involvement.