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By NBC Chicago

A gun reported stolen by a legal owner earlier this month was used to kill a 14-year-old Chicago girl on Monday, police Supt. Garry McCarthy said.

"This was a fistfight that turned to a murder with the introduction of a firearm," McCarthy told reporters as he announced homicide charges against another teen in connection with the shooting death of 14-year-old Endia Martin.

The defendant's name was not publicly released due to her age, but the Cook County State's Attorney's Office said she is also 14 years old and was charged as a juvenile with murder.

Two other people, including the shooting suspect's uncle, were in custody, McCarthy said.

McCarthy said the teens were arguing over a boy before the gun was pulled. He said the weapon's legal owner reported the gun stolen from a vehicle on April 14.

"There's not a police department in the country that allows guns to be stored in a car," he said.

Endia Martin, 14Family photo

Martin, 14, was shot in the back Monday afternoon while with a group of kids on the city's South Side. Another teen was wounded with a bullet to the arm.

Martin's father, Kent Kennedy, said Martin had been the recipient of threats.

"The little girl threatened my daughter the day before on Facebook. Today she saw my daughter standing around, and from what I heard she approached her and gunned her down cold blooded," Kennedy told NBC Chicago shortly after his daughter was killed.

Grief counselors were availble Tuesday at Tilden Career Community Academy High School, where Martin was a freshman. Friends there said the teen was small but full of energy and very enthusiastic.

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