Part two of the investigation into the murder of 37-year-old Peggy Hettrick. Her body was discovered in a field near the home of Tim Masters, and over a decade later, Masters was sentenced to life in prison for Peggy's murder. But Masters always maintained his innocence. Because of advances in forensic science, his new lawyers requested to test the DNA found on Peggy's clothing, revealing critical new evidence. “48 Hours" correspondent Susan Spencer reports. This classic "48 Hours" episode last aired on 12/24/2011. Watch all-new episodes of “48 Hours” on Saturdays, and stream on demand on Paramount+.