French television producer Sophie Toscan du Plantier was murdered in her remote Irish vacation home in 1996. A Parisian court convicted her neighbor, Ian Bailey, for the killing. But with more questions than answers, Ireland has refused for decades to extradite him.
Eugene Palmer allegedly watched from the woods as his son's wife dropped their kids off at the bus stop before opening fire with a shotgun in 2012. His case was revisited on the newly relaunched "America's Most Wanted."