WOODSTOCK – A Richmond man was sentenced Thursday to 20 years in prison for sexually assaulting a 9-year-old girl.

Ariel Guerra, 30, who also had a recent address in Crystal Lake, pleaded guilty to two counts of predatory criminal sexual assault of a child, both Class X felonies.

McHenry County Judge Charles P. Weech accepted the terms of the negotiated plea, telling Guerra that he must serve at least 85 percent of the sentence, or 17 years, before he is eligible to be released from prison. He had faced between 45 and 120 years in prison at sentencing.