It's common knowledge for public relations professionals and TV news junkies alike: If you don't want to look like you're hiding something, never, ever threaten someone on camera.
But apparently Janet Jump, the wife of the late Bob Cassilly's business partner, hasn't been watching enough Elliott Davis. Her angry response to a camera crew from Crime Watch Daily provided the biggest fireworks in the episode probing Cassilly's death that aired Monday afternoon across the nation.
As the episode portrayed it, from the minute that camera crews showed up at her doorstep, Janet Jump was livid.…