CHICAGO (CBS) — Police were investigating the death of a baby girl whose beaten body was found outside an apartment building in Uptown late Wednesday night.

A man visiting his girlfriend at an apartment building in the 800 block of West Eastwood Avenue found the child in the middle of a fall storm around 11:45 p.m. Wednesday. At first, he thought it was a naked doll, but when he looked closer, he saw it was a baby girl, with her umbilical cord still attached.

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He rushed the baby inside, and security called police. The baby was pronounced dead at Weiss Memorial Hospital, less than a block away.

On Thursday, the Cook County Medical Examiner’s office said the baby died of multiple blunt force injuries. The case is considered a homicide.

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Investigators were seen outside the apartment building early Thursday, taking pictures, collecting evidence, and interviewing residents of the building.

Detectives reviewed surveillance video from the apartment building, but the cameras were not in the proper position to record the person who abandoned the baby. Police were checking to see if a camera at a nearby school might have recorded any pertinent activity.

Police said investigators do not yet know the girl’s identity, or who her parents are.

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Area North detectives were conducting a death investigation.