Who is the Lipstick Killer?

The controversial case of William Heirens, the "Lipstick Killer" convicted of murdering two women and a 6-year-old girl in Chicago in the late 1940s. He's been jailed ever since, but insists that he's innocent. We'll explore the troubling case, from the near-hysteria of the media coverage to the inconsistencies in the physical evidence used to wring a confession from Heirens.