AUSTIN (AP) An Austin businessman and volunteer children's advocate has pleaded guilty to sexually assaulting six children and will likely spend the rest of his life in prison.

Billy Dan Carroll, 54, is scheduled to be formally sentenced next week after pleading guilty to the sexual assault charges Thursday in state district court.

Under an agreement with prosecutors, he is expected to receive life sentences on five charges of sexual assault of a child and an additional 40-year sentence on a sixth charge. The agreement also includes a two-year sentence on a charge of improperly videotaping a 13-year-old girl.

Carroll's attorney, Bill Hines, said his client agreed to the plea to avoid the embarrassment of a trial. Carroll won't be eligible for parole until he is 104.

"He did that to save and spare his family the embarrassment and the expense of going through a trial, as well as the victims," Hines said. "He's accepted responsibility and agreed to serve the maximum punishment in prison."

Carroll had been a volunteer children's advocate since 2004 before officials at Court-Appointed Special Advocates of Travis County suspended him after learning of the allegations. He had owned a court-reporting business in Austin and San Antonio.

Carroll was accused of sexually assaulting six children. Police have said they seized a videotape from Carroll's home showing him having sex with children, including a girl as young as 2.

Carroll's ex-wife, Kathy, who divorced him last year, said she hopes the plea agreement will help victims "with their healing and allow them to move on with their lives."

A lawsuit against Carroll is pending.

Information from the Austin American-Statesman: www.statesman.com

Copyright 2009 The Associated Press.