20/20 PREVIEW: Police interview Karen Read, gather evidence at boyfriend's crime scene | PART 3

Police investigating what happened to John O'Keefe say they managed to preserve samples of blood and a broken cocktail glass at the snow-covered crime scene. O’Keefe’s freezing body was discovered by his girlfriend, Karen Read, after the couple spent a night out at bars together with friends. Our newest 20/20 full episode features Matt Gutman’s interview with Karen Read, who shares her story fully, for the first time. Stream on hulu under Season 46, Episode 33.