19-year-old Samantha Grigg of Saline pleaded guilty to Manslaughter in court on Monday in the death of MSU student Dustyn Frolka. She faces up to 15 years in prison when sentenced in late May. Frolka was beaten by two other men inside a car and thrown from a moving vehicle on I-69 on February 15th. He was found dead along the roadway. Branden Heim and Tyrel Bredernitz also face charges in the case.