, because he had blamed Colom and his associates for the April slayings of a prominent businessman and his daughter . Rosenberg had represented the businessman . They were killed , Rosenberg said , because they had refused to participate in acts of corruption as the president wanted . `` It 's the time-honored tradition in Guatemala that if someone gets in your way , there 's likely to be a violent outcome , '' said Donald J. Planty , the U.S. ambassador to Guatemala from 1996 to 1999 . Colom took to the airwaves Monday night to vehemently deny that he , his wife or the aide had any connection to the slayings . He promised a full investigation and said he would accept international help , asking the U.S. Federal Bureau of Investigation to become involved . A Guatemalan newspaper reported Thursday that an FBI agent had arrived in the country in connection with the investigation . But Rosenberg supporters say they do n't believe the Guatemalan government can carry out an impartial and thorough investigation and want Colom out . Perez said Vice President Jose Rafael Espada could take over until the investigation is complete . ``
-LRB- CNN -RRB- -- Guatemalan President Alvaro Colom should leave office during the investigation into whether he was connected to three recent slayings , his 2007 presidential opponent said Thursday . Guatemalan President Alvaro Colom has said he has no intention of giving up power over the slayings inquiry . Retired Gen. Otto Perez Molina , who lost to Colom in a runoff , said Guatemala is suffering its worst crisis since the democratic process began in 1985 after years of civil war . Demonstrations will continue and anger will mount unless Colom temporarily steps out of the way to allow an unblemished probe , he said . `` We want an impartial investigation , a transparent investigation , '' Perez told CNN . `` The president must leave his post . '' The crisis started Monday with the surfacing of a video in which Guatemalan attorney Rodrigo Rosenberg said Colom , the president 's wife and a top aide would be responsible if something happened to the lawyer . Rosenberg was gunned down Sunday while riding his bike in Guatemala City . He had recorded the video last week . Rosenberg was being threatened with death , he said