In a quiet suburb of Utah, a Mormon man killed his wife, before committing suicide. Multiple neighbors described them as a normal couple whom they had never seen quarrel. But this isn't a whodunit. The police investigation never wavered on who committed the crime. The question is, why? Why did the lives of this seemingly normal couple end in such tragic fashion. Finding the answers will take us from Catholic Italian New Jersey to a very non-Mormon lifestyle in Los Angeles to a funeral in Florida. And we'll learn the answers from many woman, living around the country, all of whom felt like they were the victim's best friend. This is My Best Friend's Killer.