At 3:04am Deputies were dispatched to a report that a Semi struck a pedestrian in the 15800 block of Durand Ave. in the Town of Yorkville. It was reported that a 43yo female ran into the roadway to retrieve her dog when she was struck by the semi. Deputies arrived on scene and began lifesaving measures on the female until rescue personnel arrived on scene. The female was transported to Wheaton Franciscan Racine where she was later pronounced deceased. The operator of the semi is cooperating with the ongoing investigation. At this time it appears that this is an unfortunate accident.