Authorities say 19-year-old Ashley Simpson of Machesney Park was leaving a carnival Friday night with her brother when she was hit. A pick-up truck was heading northbound on North 2nd Street. Witnesses say the driver of the truck did stop near the scene, but then decided to take off.
Fifty-year-old James Ennis of Rockton has been arrested. The Winnebago County Sheriff's Department says Ennis was charged with failing to report an accident involving a death.
He was released from custody after posting 10 percent of a $50,000 bond. An autopsy for Simpson will be performed on Monday.