An inmate who claims to have killed more than 90 women across the U.S. is now considered the serial killer with the highest number of victims in the country's history, the FBI reported.Samuel Little, who has been in prison since 2012, told investigators last year that he had killed about 90 people across the country between 1970 and 2005.The FBI said in a statement Sunday that federal analysts have reason to believe that all his confessions are credible, and so far the authorities have been able to...