Columbia Police are investigating a homicide that took place early Saturday morning in the 1800 block of McKee Street. Officers responded to the scene shortly after 12:30 am and located three gunshot victims. A teenage girl was located inside the residence and officers provided emergency medical care. She was transported to a local hospital where she was later pronounced dead. A boy and an adult male were also injured. The boy was transported to a local hospital in a personal vehicle for treatment while the man refused medical treatment at the scene. The investigation into the fatal shooting is ongoing. Anyone with information is encouraged to call the Columbia Police Department at 573-874-7652 or Crimestoppers at 573-875-8477 to remain anonymous.