A spokesman for Palm Beach Gardens police in Florida confirmed to the BBC they were investigating a fatal crash involving the Grand Slam champion.
A man was taken to hospital after the accident on 9 June and died two weeks later from his injuries, he said.
According to US tabloid website TMZ, which broke the story, police believe she was at fault but her lawyer says it was an accident.
The man who died, Jerome Barson, was travelling with his wife who was driving their vehicle through an intersection when the collision happened.
