Dateline producer Marianne O'Donnell reflects on what it was like to cover the 2017 murders of Abby Williams and Libby German in Delphi, Indiana, and the trial that followed nearly seven years later.

Trinity Shockley is accused of planning to bring a gun to Mooresville High School in emulation of other school shooters.

The FBI arrested two teenage girls plotting a "mass casualty attack" using pipe bombs and guns targeting Memorial High School ...

Shockley was a senior in Mooresville Schools until Feb. 20 when her plans for a Valentine’s Day mass shooting in the cafeteria were discovered. This is the same school my daughter attends, the same ...