Police continue to investigate the crash that killed a 17 year-old Casco Township teen on Monday. According to the St. Clair County Sheriff’s Office, Grace Achatz died as a result of injuries sustained in the crash, which occurred at the corner of Wadhams and Fred Moore Highway around 5:00pm. She was driving southbound on Wadhams Road, when she failed to yield at a stop sign, and was broadsided by a vehicle driven by a 63 year-old man from Ontario, who was driving westbound on Fred Moore Highway. She was transported to St. John River District Hospital, where she was pronounced dead. The 63 year-old Ontario man and his passenger were both transported to St. John River District Hospital with undisclosed injuries. Members of the St. Clair Police Department and Fire Department assisted at the scene of the crash, which caused the intersection to be closed for about two and a half hours. The accident remains under investigation.