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By Donna Owens BALTIMORE (Reuters) - An FBI agent on Monday accused lawyers for a convicted murderer of manipulating cell phone records in their bid to win a retrial for the Maryland slaying made famous by the podcast "Serial." Adnan Syed, 35, is serving a life sentence for the 1999 strangulation of his 18-year-old ex-girlfriend Hae Min Lee. Syed's lawyers are seeking a new trial based on new evidence amid questions about the fairness of the case that were raised by the podcast in late 2014. During the fourth day of a hearing in Baltimore City Circuit Court, Federal Bureau of Investigation Special Agent Chad Fitzgerald said defense lawyers had shown him "manipulated evidence" of cell phone records when he was on the stand last week.