CHICAGO (CBS) — A 21-year-old man from Chicago faces up to life in prison, after a federal jury last week convicted him of carjacking an off-duty police officer in the Edgewater neighborhood.

Jamar Jarvis was found guilty of carjacking and brandishing a firearm in connection with a carjacking on Friday. The carjacking charge carries a sentence of up to 15 years in prison, and the weapon charge carries a sentence of 7 years to life in prison.

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Sentencing has been scheduled for Dec. 13.

Jarvis and three others were indicted in 2019 on federal charges accusing them of carjacking an off-duty Chicago Police officer on Oct. 18, 2018.

Jarvis, Raynell Lanford, and Jamaal Ashsaheed, who were both 19 at the time, were charged with carjacking and weapons charges. A fourth teen, Javion Bush, who also was 19 at the time, was charged as an accessory for helping the assailants after the carjacking, police said.

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At the time, police said Jarvis, Lanford, and Ashsaheed approached an off-duty officer in the Edgewater neighborhood, showed her a gun and demanded the keys to her Lexus SUV.

Federal prosecutors said they then drove to a gas station in the South Loop, where they bought gas and a gas can. Chicago police later arrested them.

Lanford and Ashsaheed have pleaded guilty to carjacking and weapons offenses, and Bush pleaded guilty to being an accessory after the fact.

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Last year, Lanford was sentenced to 10 years and 2 months in prison, Ashsaheed was sentenced to 9 years in prison, and Bush was sentenced to 15 months in prison.

CBS 2 Chicago Staff