Web site tmz.com reported she is Thornton's daughter, but police spokesman Lee Stephens said the police records department was closed Sunday and he couldn't find out whether Brumfield is related to Thornton.
Brumfield told detectives that a girl she was babysitting hit her head in a fall in an Ocoee home on Oct. 3, Detective James Berish said in a news release. Brumfield called for help more than two hours later when she couldn't revive the girl, police in the city near Orlando said.
An autopsy determined the girl had a fractured skull and brain injury. The medical examiner ruled the death a homicide and said the explanation Brumfield gave was inconsistent with the child's injuries, police said.
Thornton's publicist Arnold Robinson said the actor has not had contact with Brumfield for quite some time.
He wouldn't confirm that Brumfield was the woman arrested, but that when Thornton was "informed about this situation" he commented that, "Anytime a baby's life is lost is an unimaginable tragedy and my heart goes out to the baby's family and loved ones."
Police did not know whether Brumfield had an attorney.
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