Business News US’s most prolific serial killer has murdered at least 50 A 79-year-old man murdered at least 50 people, making him the most prolific serial killer in US history, the FBI said More… Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related ‘Lebanon is against any activities hostile to Gulf nations’ Priyanka Chopra eyes Marvel superhero role