Nurse Amy Ridgway joined Katie Couric to talk about what it was like going undercover to help capture her colleague and best friend, the “Angel of Death” serial killer, Charles Cullen. After investigators proved to Ridgway that Cullen was the killer, she agreed to help authorities capture him. Ridgway was able to convince her friend to confess by getting him to believe confessing would be heroic. In 2006, Cullen pleaded guilty to committing 29 murders, and was sentenced to 11 life sentences.moreless
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