Bart S. Babino, 40, Kettle Moraine Correctional Institution, was charged Sept. 5 with two counts of sexual assault of a child and two counts of repeated sexual assault of a child.
Babino is accused of having sex from June 2006 to December 2010 with a girl who was 10 years old when the assaults began, according to the criminal complaint.
The girl told investigators that over time, she felt like she was married to Babino because he became angry whenever she failed to answer his phone calls.
She said the sexual assaults stopped after she talked about the situation with her aunt.
Babino is currently serving five years in state prison after he was convicted in August 2011 of repeated sexual assault of a child in Outagamie County during the same time period.