Mother in the Harbor: Rachael's Secret

On September 13th, 2006, a woman's body was found floating in Newport Beach Harbor in California. It was 56-year-old Barbara Mullenix, who had been stabbed more than 50 times--a sign detectives said meant she likely knew her killer. Detectives at first looked at her ex-husband Bruce, but soon moved their focus to her daughter Rachael and her boyfriend Ian Allen, as the evidence led investigators to an unthinkable conclusion. Erin takes you deeper into the "48 Hours" investigation, "Lady in the Harbor".