assassination , Castresana said . Rosenberg fed information to the hit squad leader that led to his own death , giving descriptions of what the target looked like and where he would be . `` It was the two brothers and no one else , '' Castresana said . `` Not a politician . Not a -LSB- government -RSB- minister . Not a police chief . No one . Just these two brothers . '' About 300 investigators from 11 nations reached their conclusion after an exhaustive examination of 100,000 telephone calls , 9,500 documents , surveillance videotapes , and 135 interviews with 11 suspects and others , Castresana said . Colom had maintained since the May 10 slaying that he was innocent despite Rosenberg 's explosive videotape , which was made public the day after his death . Guatemalan authorities have arrested 11 men on suspicion that they carried out the killing , but the Valdez Paiz brothers remain at large . Their lawyer , Alexis Calderon , denied last week that his clients were involved . `` This is a story being made up to implicate people who did n't have anything to do with it , ''
-LRB- CNN -RRB- -- A lawyer who left a videotape saying Guatemalan President Alvaro Colom would be responsible if anything happened to him masterminded his own death last year , a special United Nations commission said Tuesday after an eight-month investigation . Colom had nothing to do with the killing , said Carlos Castresana , head of the International Commission Against Impunity in Guatemala . `` Rodrigo Rosenberg , for some reason , decided to put an end to his life , '' Castresana said at a televised news conference . Rosenberg was shot from behind in a brazen daylight attack while riding his bicycle in Guatemala City , the nation 's capital . He was shot three times in the head , once in the neck and once in the back , Castresana said . Prominent Guatemalan brothers Francisco Jose Valdez Paiz and Jose Estuardo Valdez Paiz hired hit men at the behest of Rosenberg , who told them he was being threatened by someone , Castresana said . The two brothers , who own a pharmaceutical company , had been cousins of Rosenberg through a previous marriage and did not know that he was the target of the