American sprinter Tyson Gay's 15-year-old daughter has died after she was shot in Kentucky on Sunday.

Teenager Trinity Gay was pronounced dead at UK Hospital following a shooting in the early hours of the morning.

The Lexington Police Department confirmed that a homicide investigation is under way after witnesses stated that shots were fired from two vehicles outside a restaurant in Lexington.

A statement from Lexington Police said: "Around 4 a.m. Sunday, October 16, officers responded to the parking lot of the Cook Out restaurant located at 855 S. Broadway in reference to shots fired. Witnesses reported an exchange of gunfire between two vehicles, a grey Dodge Charger and a dark-coloured sports car with tinted windows.

"A juvenile who was struck at the scene was transported to a hospital by private vehicle and then transferred to UK Hospital, where she was pronounced deceased.  The victim has been identified by the Fayette County Coroner’s office as 15-year-old Trinity Gay of Lexington.

"Officers located the Dodge Charger and detained two possible persons of interest for questioning. Police are still working to locate the other vehicle involved."

USA Track and Field tweeted: "Sending our thoughts & prayers to @TysonLGay & his loved ones as they mourn the tragic & senseless loss of his daughter, Trinity."