Billy Bob Thornton's daughter sentenced

Billy Bob Thornton's estranged daughter Amanda Brumfield has been sentenced to 20 years in prison over the aggravated manslaughter of her best friend's 12-month-old daughter.

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

Amanda Brumfield - the 32-year-old offspring of the actor and his first wife Melissa Parish - was found guilty of aggravated manslaughter earlier this year and today (06.10.11) was sentenced for the offence.

In May, a court convicted Brumfield over the 2008 death of her best friend's 12-month-old daughter Olivia Madison Garcia, who she had claimed hit her head in a fall as she climbed out of her playpen.

However, prosecutors had argued it was "impossible" for the three-and-a-half inch skull fracture Grace suffered could have came from a fall at that height, though her lawyers claimed it could have aggravated an old injury.

A source close to Brumfield - who had been found not guilty of first degree murder and aggravated child abuse charges - told RadarOnline.com that she plans to appeal the sentence.

Billy Bob has been estranged from Brumfield for some time.

The actor has been married five times - including to Hollywood beauty Angelina Jolie - in total and has fathered four children by three different women.