Sheryl McCollum is a CSI for a metro Atlanta Police Department as well as the Director of the Cold Case Investigative Research Institute, a collaboration between universities and colleges that brings researchers, practitioners, students and the criminal justice community together to advance techniques in solving cold cases. Some of the high-profile crimes Sheryl and her students have worked on include: Tu Pac Shakur, Chandra Levy, Natalee Holloway and The Boston Strangler.