U.S. prosecutors name FBI agent accused of leaking insider trading probe

(Adds details on case, background on FBI agent) By Nate Raymond NEW YORK, Jan 4 (Reuters) - U.S. prosecutors on Wednesday identified the FBI agent who they say admitted to leaking information to reporters about an insider trading probe involving a Las Vegas sports gambler and golfer Phil Mickelson. David Chaves, a Federal Bureau of Investigation coordinating supervisory special agent, was named in court papers filed in Manhattan federal court as the agent prosecutors say leaked details about the