Home Current News FBI: Most prolific serial killer in U.S. murdered at least 50NewsCurrent NewsFBI: Most prolific serial killer in U.S. murdered at least 50October 7, 2019107FacebookTwitterPinterestWhatsApp A 79-year-old man murdered at least 50 people, making him the most prolific serial killer in U.S. history, the FBI said Sunday.Source: yahoo.com/news