ANGEL OF DEATH – Serial killer nurse Charles Cullen confessed to as many as 40 murders, but some believe he killed many, many more patients over a 16-year career. The serial killer speaks to Steve Kroft in his first television interview. Graham Messick is the producer.  THIS IS A TWO-SEGMENT REPORT.

THE RACE TO SAVE THE TORTOISE – Turtles and tortoises have been roaming the planet for 200 million years, but now many of them are endangered by poachers, who can sell some animals for as much as $60,000. Lesley Stahl reports from Madagascar.  Andrew Metz is the producer.

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Contact:                       Kevin Tedesco   212-975-2329  kev@cbsnews.com