Authorities believe the body of a slain 3-year-old girl found Sunday afternoon in a wooded area in south suburban Riverdale is that of a child reported missing in Chicago.

Riverdale police received a call from a person about 3:25 p.m. Sunday who reported finding the child’s body while walking in the area of the 14000 block of South Normal Avenue.

Chicago Police were investigating whether the body is that of a child from the 3500 block of South Rhodes Avenue in the Douglas neighborhood on the South Side who had been reported missing.

Chicago detectives are working with Riverdale Police, Illinois State Police and the South Suburban Major Crimes Task Force as the investigation continues, police said.

The girl’s body was pronounced dead at the scene about 7 p.m. Sunday, according to a spokesman for the Cook County Medical Examiner’s office.

An autopsy Monday found the 3-year-old died of a subdural hematoma and closed head injuries from an assault, according to the medical examiner’s office. Her death was ruled a homicide.

Her identity was not released Monday afternoon pending notification of relatives, a spokeswoman said.

Police had said that the child was with an adult, who walked away for a brief moment, then returned to find the child missing, according to preliminary information.