(South Fairmount) A teenage boy is in critical condition after an accident in South Fairmount Wednesday evening. Cincinnati police said at about 7:40 p.m. 19-year-old Willie Monghan was driving a Chevrolet Malibu on Harrison Avenue when he crossed the center line and slammed into a United States Postal Service Truck. Monghan and his front seat passenger, 19-year-old Ricky Patterson, were not injured. The back seat passenger,19-year-old Terry Feagin, suffered serious injuries. He was last listed in critical but stable condition. The driver of the USPS truck was not injured. Police continue to investigate.