In the video from the 2014 trial, defendant Siale Angilau can be seen standing from his chair, taking a pen from his defense counsel's table, sprinting and lunging toward the witness, who narrowly ducked out of the way before a US marshal shot four times, striking Angilau.
"Whoa, whoa, whoa", someone yells as the witness, another gang member who is shackled and chained, manages to retreat into a corner of the courtroom. He was not hurt, the "Daily Mail" reports.
The female USA marshal, named only as Jane Doe, then fires four shots, killing Angilau. US District Judge John Dowdell decided to make the video public after he dismissed a lawsuit brought by Angilau's family claiming excessive force.
In the 24-second clip, Angilau is seen suddenly standing up at the defendant table, grabbing a pen or pencil near him and running toward the witness stand, where another member of the gang was testifying.
An FBI investigation found the shooting was legally justified.
Angilau's family argued the use of deadly force was not permissible in this case and claimed that the deputy fired several shots into Angilau's back after he was already incapacitated.
As someone yells, "whoa, whoa, whoa", but before any officers could react, Angilau sprinted toward the witness and leaped with his right arm cocked overhead with the pen in hand. "His attack was stopped by the shots that Jane Doe rapidly fired, in less than one and one-half seconds".
The video is muzzed to keep the judge, officers and any witnesses in the courtroom from being identified. The family had been allowed to view the video, but not to release it.More news: Dybala returns Juve to Serie A summit as Napoli held at Inter
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Angilau was shot dead by a US Marshal.
A judge chose to release courtroom footage of the incident after a lawsuit from Angilau's family was dismissed.
But he said the family is glad the video has been made public - and that they want justice. He dismissed Angilau's family's lawsuit which claimed excessive force was used in the incident.
Angilau was one of 17 people named in the 2010 indictment against Tongan Crip members, accusing them of assault, conspiracy, robbery and weapons offences. Angilau was the last person to be tried, as previous defendants were sentenced to 10 to 30 years behind bars.
Before he died, the incident prompted US District Judge Tena Campbell, who was hearing the case, to declare a mistrial.
Faces of nearly all the people present inside the courtroom at the time, including the judge is blurred in the video.
The Utah Media Coalition fought for a year for Dowdell to release the footage, according to KUTV in Salt Lake City.