A 23-year-old man has been convicted of attacking a 19-year-old woman a little over 13-months ago, at a rest stop off Interstate 29 near Onawa. The Monona County Attorney’s Office says Mark Bitzan was accused of taking the woman into a stall in the women’s restroom, threatening her with a knife and sexually assaulting her. The crime occurred on Dec. 17th, 2010. A jury convicted Bitzan on Tuesday. His sentencing has not been scheduled yet. Bitzan was also convicted in 2006, of a sexual assault in Natrona County, Wyo.