Jealousy may be the motive for the slaying of a Quad-Cities teen. A 16-year-old girl who tells investigators she works at a Davenport movie theatre may have been jealous of a classmate at the Black Hawk Outreach Center, where both girls were working to get a GED. Sarah Kolb is charged with first-degree murder and on Friday investigators say they found body parts near a small town in Illinois where Kolb once lived. The body of the victim had been dismembered and authorities who found more parts of it at a historic site in the Quad Cities say an attempt had been made to burn the remains. 17-year-old Cory Gregory of Moline is also charged with murder, and with concealing a murder, and police say they expect to round up at least one more teen suspect.