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FILE - A Magna teenager already facing two counts of murder in adult court now faces an additional criminal charge.

SOUTH SALT LAKE — A Magna teenager already facing two counts of murder in adult court now faces an additional criminal charge.

Jose Humberto Mancia, 17, of Magna, was charged Tuesday in 3rd District Court with assault by a prisoner, a third-degree felony.

On Dec. 23, Mancia was spotted by a corrections officer "aggressively" punching another inmate, and "continued the assault despite multiple orders to stop fighting," according to charging documents.

Mancia is already charged with two counts of murder for his role in a crash that killed two people in September. The incident sparked an outcry from Kearns residents demanding a stop to gang violence in their community.

Mancia, along with Argenis Daniel Ramirez Saedt, 19, of Millcreek; Jose Luis Muñoz-Lugo, 24, of Salt Lake City; and Rosalio Andres Alvarez, 19, of Murray — all documented gang members — are each charged with two counts of murder, a first-degree felony; plus felony discharge of a firearm, a second-degree felony. Mancia was also charged with possession of a firearm by a restricted person, a third-degree felony.

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On Sept. 19, prosecutors say the four were fleeing the scene of a drive-by shooting at a high rate of speed when their F-150 pickup truck ran a stop sign, went airborne after hitting a ditch, and slammed into a Toyota Yaris, killing Tami Lynn Woodard, 50, and Lloyd Everett Pace, 55, both of Kearns.

Witnesses told investigators that moments before the crash, they observed the pickup approach a known gang house on the corner of 5240 W. 5391 South. A man in the back seat pointed a gun out the window and two to four shots were fired, according to charging documents.

A preliminary hearing for Mancia in the murder case is scheduled for June 6.