Unusual Suspects S06E11 - Dead End Trail

In the summer of 1981, Southern Illinois University student Susan Schumake is discovered murdered on a popular campus trail. The 21-year-old co-ed was last seen leaving her job at the radio station just before someone grabbed, raped and strangled her to death. Did she fall victim to a paroled rapist working on campus or did a fellow student bring her life to a tragic end?