South suburban Chicago authorities say someone shot and killed a 17-year-old pregnant girl on Christmas Day — but that her baby survived.

Police say doctors pronounced the Calumet City teenager dead at an area hospital Thursday morning. She'd been shot in the back of the head Wednesday in Dolton. Her identity wasn't immediately known.

Dolton Police Chief John Franklin expressed condolences to the teen's family. He added that it's "unimaginable to lose a child on such a holy day."

Police say the fatally injured teen was found Wednesday evening lying on the ground between two houses in the south suburban community. She was around 5 1/2-months pregnant.

No suspects were in custody. But Franklin says there are leads in the case.