Lexington police detectives were investigating on Wednesday night at a home on Graviss Court where an unresponsive child was found.
The child, a 3-year-old who was not identified, was rushed to University of Kentucky Chandler Hospital, where she was pronounced dead, police said.
Police and firefighters who had received a call about a missing child responded to the house shortly after 3 p.m., police spokeswoman Sherelle Roberts said.
Officers and firefighters began searching for the child, who reportedly had been missing for about 30 minutes. A firefighter found the child unresponsive. Her injuries were not disclosed Wednesday.
Never miss a local story.
Police Lt. Mario Russo said the child was found inside the home where she apparently had gone missing. The tan, single-family home is in the 600 block of Graviss Court, off Clays Mill Road near Man o' War Boulevard.
Russo said it was too early in the investigation Wednesday night to determine whether foul play was suspected. Detectives from Lexington's robbery-homicide unit and crimes against children unit were on scene until after 9 p.m. Fayette County Commonwealth's Attorney Ray Larson also was at the scene for a short time