Prosecutors in Kenosha, Wisconsin, asked a judge to admit a video as evidence against Rittenhouse.
It shows him saying he wished he had his gun to shoot at people leaving a pharmacy, they said.
Prosecutors said the video showed Rittenhouse's state of mind weeks before he fatally shot two men.
Prosecutors said a newly surfaced video taken just weeks before last year's deadly Kenosha shootings captured the Illinois teenager Kyle Rittenhouse describing his wish to shoot at people with an AR-15 as they left a pharmacy.
According to court documents obtained by Insider, prosecutors are seeking to have the judge admit the video as evidence in Rittenhouse's upcoming trial. They said the video provided "crucial insight" into Rittenhouse's state of mind in summer 2020.
The 29-second video, which has been published by the Milwaukee Journal Sentinel, does not show Rittenhouse's face. The video was apparently filmed across the street from a CVS Pharmacy, where several hooded people could be seen rushing out and clutching items.
A voice that sounds like Rittenhouse's can be heard saying, "Bro, I wish I had my f—ing AR. I'd start shooting rounds at them."
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It's unclear who filmed the video, where it was filmed, or how prosecutors obtained it. Rittenhouse's attorney did not immediately respond to Insider's request for comment.
Rittenhouse, 18, is charged in connection with the killing of the 36-year-old Joseph Rosenbaum and the 26-year-old Anthony Huber and the severe injuries of the 26-year-old Gaige Grosskreutz. The accusation against Rittenhouse stem from heated racial-justice protests in Kenosha on August 25. His trial begins November 1.
Prosecutors alleged Rittenhouse was "hunting humans" that evening and shot the men as an act of vigilantism. Rittenhouse has said that all three men were chasing him and that he opened fire in self-defense.
In their motion on Wednesday, Prosecutors wrote that the new video, taken just 15 days before the Kenosha shootings, showed Rittenhouse "saw something, jumped to a conclusion based on exactly zero facts, and then threatened to kill someone based on his baseless assumption and wrongful interpretation."
Prosecutors added that Rittenhouse didn't know the people outside the CVS or what they were doing, was merely watching from a vehicle parked across the street, and was not interacting with anyone involved.
"The video proves that the defendant was ready and willing to use deadly force in a situation where it was completely unjustified," the motion said.
"The video also demonstrates that the defendant fervently sought to insert himself as an armed vigilante into situations that had nothing to do with him," prosecutors added.
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