Updated 03/22/12 – 3:15 p.m.

CHICAGO (CBS) — A woman who was shot by an off-duty Chicago Police detective has died and man who was shot in the same confrontation has been charged with assault.

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Rekia Boyd, 22, of the 1500 block of South California Avenue, was pronounced dead at 1:15 p.m. at Mount Sinai Hospital, according to the Cook County Medical Examiner’s office.

Boyd and 39-year-old Antonio Cross were shot by an off-duty detective early Wednesday morning in the 3100 block of West 15th Place in the North Lawndale neighborhood after the detective saw several people causing a disturbance.

Police say Cross approached the detective with a gun. The detective was asking a group of people to quiet down as they caused a disturbance.

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Cross, of the 7100 block of South Ridgeland Avenue, is charged with misdemeanor assault.

Police said around 1 a.m. Wednesday, the off-duty detective was pulling out of an alley in his car, when he came across four people who were being loud and rowdy on the street.

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Police say the detective rolled down the window of his vehicle to investigate, and saw a man approach him with a handgun, then allegedly point it at him.

“(He) rolls the window down and says, ‘Hey guys, keep the noise down.’ At that point, one of the offenders comes at him as he’s sitting in his car. The offender has a weapon in his hand. The officer announced he’s police – ‘Drop the gun! Police!’ The offender continues to advance on him,” Chicago Fraternal Order of Police spokesman Pat Camden said. “At that point, the officer fires, in fear of his life.”

Cross was reportedly shot in the hand, while a woman was shot in the head.

Cross was treated and released from the hospital as of early Thursday, police said. Information on the woman’s condition was not available.

Two other people involved in the disturbance ran and were picked up by another vehicle, Camden said.

Cross was released on a personal recognizance bond and will next appear in court April 11, according to police News Affairs Officer Amina Greer.

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The Sun-Times Media Wire contributed to this report.