Suspect: 'I'm sorry' for Penn murders; mystery Cancun vacation death

A Pennsylvania man confessed & apologized for killing 4 men. Psychologist Caryn Stark & reporter Jamie Stover join Nancy Grace on this story. A dream Cancun vacation turns tragic for a Wisconsin family. Why did police not probe the death of the daughter after an unexplained poolside incident. Radio host David Mack discusses the case with Grace. Blaze reporter Robin Walensky talks about not-so-bright bride who forgot an important detail before hiring a hitman to kill her groom.

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