(KNZA)--A Fairview man, convicted on a pair of a child sex charges, has been sentenced to life in prison.

Brown County Attorney Kevin Hill said 45-year-old Darin Lierz was sentenced Monday in Brown County District Court on two counts of aggravated indecent liberties with a child.

Lierz pleaded no contest to the charges last month that arose out of criminal conduct against a 4-year-old child.

As a Jessica's Law sentence, he will have to serve a mandatory minimum term of 25 years before he's eligible for parole. Lierz was ordered to have lifetime registration as a sexual offender as well as lifetime post release supervision, if he is ever released from prison.

Hill said Lierz's attorney filed a motion for a sentencing departure, arguing for intensive probation in lieu of a life sentence. Hill argued against the motion, pointing out Lierz's repeated sexual molestation of the 4-year-old victim in the case. His argument also included the playing of a video of Lierz's admissions to a KBI agent of involvement in extensive criminal conduct against at least 10 children over a period of 20 years.

Lierz was arrested last September following an investigation by the Brown County Sheriff's Office with a forensic interview by investigators with the Kansas Department of Children and Families.