4/25: Was Conn. teen fatally stabbed over prom date choice?; On the Road: Waitress receives the tip of a lifetime

      |Police are investigating whether a dispute over the prom led to the fatal stabbing of 16-year-old Maren Sanchez; and, Steve Hartman meets Melissa Mainier, a Pennsylvania waitress who, thanks to a generous tipper, paid off her entire nursing school debt.

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