(CNSNews.com) - A paid Mexican informer for the U.S. government who worked in an undercover operation targeting a major narcotics cartel allegedly went off the rails and was involved in more than a dozen murders. Amid allegations of a bungled investigation and an accompanying cover-up, at least one member of Congress is calling for hearings into the matter (see related story). Guillermo Ramirez Peyro is now fighting an attempt by the U.S. government to deport him and said he fears for his life at the hands of the cartel should he be sent back to Mexico. Statements from key players...