Murdered in broad daylight, everyone wants to know what happened to teenagers Abby Williams and Libby German. Who is the Delphi killer? "IMPACT x Nightline" goes inside the trial of the man charged with their brutal deaths.

Miss Universe, and its sister pageant Miss USA, have long been the pinnacle of the pageant world, with the ability to launch its queens into the stratosphere. But, recent changes in ownership have caused many to wonder if the crown has lost its luster.