Billy Bob Thornton's daughter sentenced to 20 years in prison

This image provided by the Orange County Jail shows the booking photo of the estranged daughter of actor Billy Bob Thornton, Amanda Brumfield, who was booked at the Orange County Jail on Wednesday June 24, 2009.

/ AP/Orange County Jail

(CBS/AP) ORLANDO, Fla. - Amanda Brumfield, the estranged daughter of actor Billy Bob Thornton, has been sentenced to 20 years in prison for the October 2008 death of her best friend's 1-year-old daughter during an overnight stay at her home.

Brumfield was sentenced Thursday, four months after she was ;convicted of aggravated manslaughter of a child. She was acquitted of first-degree murder and aggravated child abuse charges.

The 32-year-old claimed that Olivia Madison Garcia hit her head after falling while trying to climb out of a playpen.

Prosecutors said it was "impossible" that a fall from that height would cause a three-and-a-half inch fracture on the girl's skull.

Brumfield is the oldest of five children of the 55-year-old actor, who has been married five times. Her mother is Melissa Lee Gatlin, who was married to Thornton from 1978 to 1980.

[mari1963]

Where is the father of this baby?