Posted Friday, October 10, 2008 --- 8:20 p.m.

Note: The name of the father will not be used to protect the identity of his daughters.

MADISON, Wis. (AP) --- A Sun Prairie father pleaded no contest Friday to charges of repeatedly sexually assaulting his three daughters, often using a secret basement room.

The 39-year-old man was convicted of charges including three counts of repeated sexual assault of a child and three counts of possessing child pornography, all as a repeat offender.

He's due to be sentenced in about two months.

The criminal complaint said he built the room behind a false wall in his basement where he viewed child porn and had sex with the girls, who were of ages 9 to 13 when the assaults occurred between 2002 and 2007.

He is serving prison terms for prior convictions for lewd and lascivious behavior and drug possession.

Copyright 2008 The Associated Press.