Los Angeles ( CNN ) -- A Los Angeles County sheriff 's captain is under investigation , suspected of springing a prisoner from jail to get free tips on his golf swing . The lessons from Frank Carrillo , a convicted jewel thief with a reputation as an expert golfer , allegedly took place on a course on Catalina Island , where Carrillo was serving a sentence on charges of theft , including stealing during a golf match a World Series ring that belonged to former Dodgers catcher Jimmy Campanis and a Rolex watch . Acccording to a claim from sheriff 's deputy William R. Cordero , Capt . Jeff Donahue `` illegally transported ( inmate Frank ) Carrillo to a local golf course where he was given golf lessons by Carrillo . '' The claim says that the captain had `` Carrillo 's prison yellow jumpsuit and wristband removed ... then had Carrillo outfitted in civilian golf clothes including a polo shirt and Docker pants . '' In his claim against the County of Los Angeles , Cordero alleges he has been threatened , harassed , transferred and not promoted because he blew the whistle on the golf outing . The claim says Donahue told Cordero that L.A. County Sheriff Lee Baca cleared the golfing excursion . `` Sheriff Baca did not condone any golf outing and would not ever , '' sheriff 's spokesman Steve Whitmore told CNN . `` We take this very seriously . This is something we have been aware of and we are conducting an internal investigation to find out what exactly did or did not happen . '' Donahue , who is part of the sheriff 's force at Avalon that polices California 's Catalina Island , is on medical leave . He did not immediately return a call to the station seeking comment . Documents show Carrillo was convicted in December of 2010 of three counts of grand theft , receiving stolen property and two counts of burglary .
Alleged lessons from a convicted jewel thief lead to an investigation . A sheriff 's deputy says he has been threatened for blowing the whistle on the golf outing . Sheriff Lee Baca ` ` did not condone any * ##ing , '' his deputy says .