CHICAGO (BAMM Network) — An independent autopsy commissioned by the family of 18-year-old Nolan Xavier Wells has been unable to determine how the Mississippi college student died, adding new questions to a case that has drawn national attention and intensified calls for a transparent investigation. Elmore Wonsley, center, speaks next to attorney Ben Crump, left, and Rev. Al Sharpton during a memorial service for Nolan Xavier Wells, an 18-year-old found dead after taking a Jul