In 1983, 45-year-old mother of four Susan Tice and 22-year-old aspiring fashion designer Erin Gilmour were sexually assaulted and stabbed to death within months of each other. For decades their killer eluded police but, advances in science and the use of genetic genealogy finally led investigators to a suspect they believe is responsible for their deaths. In this episode we find out how a cold case is now getting closer to becoming a closed case.