( CNN ) -- A Virginia grand jury indicted six Colombian nationals Thursday for the kidnapping and murder of a Drug Enforcement Administration agent in the South American country during an attempted robbery last month , federal authorities said . Special Agent James `` Terry '' Watson died after being stabbed in a taxi in Bogota , Colombia , on June 20 . He was assigned to the DEA unit in Cartagena and was on temporary duty in Bogota . The six defendants operated a robbery and kidnapping conspiracy using cabs in Bogota to lure victims , and the driver of the cab would signal to conspirators to commence the abduction and robbery , the U.S. Justice Department said in a statement . Watson was allegedly shocked with a stun gun by one defendant and stabbed with a knife by another defendant , the Justice Department said . 10 things to know before visiting Colombia . Watson , 42 , had been watching the last game of the NBA finals at a Bogota restaurant at night and left in a taxi , a State Department spokesman said last month . Investigators believe Watson 's cab stopped at a traffic light and his assailants jumped out of two other cabs , which pulled up on either side of the vehicle in which he was riding , a law enforcement official said . According to the official , Watson managed to escape from the cab and was taken to a hospital , where he died . In Colombia , such attacks are known as `` millionaire rides . '' Authorities said the suspects they arrested were part of a gang known for millionaire ride robberies . The DEA said Watson was a 13-year veteran of the agency . He had been sent to Afghanistan three times on counternarcotics trafficking assignments and had previously served in the Army and worked for the U.S . Marshals Service . The indictment sends `` an unmistakable message to all who commit acts of violence against America 's law enforcement professionals : no matter who you are or where you live , we will do everything in our power to hold you accountable to the fullest extent of the law , '' U.S. Attorney General Eric Holder said in a statement . Indicted were : . -- Gerardo Figueroa Sepulveda , 38 . -- Omar Fabian Valdes Gualtero , 27 . -- Edgar Javier Bello Murillo , 26 . -- Hector Leonardo Lopez , 23 . -- Julio Estiven Gracia Ramierez , 30 . -- AndrÃ©s Alvaro Oviedo-Garcia , 21 . Each of them was charged with two counts of second-degree murder , one count of kidnapping and one count of conspiracy to kidnap . Oviedo-Garcia was also charged with two counts of assault . The federal grand jury in Virginia also indicted Wilson Daniel Peralta-Bocachica , 30 , a Colombian national , for his allegedly trying to destroy evidence in Watson 's murder , the Justice Department said.col TV reported . The United States will request extradition of the suspects , but it has not yet done so formally , a law enforcement official said . U.S. officials have extradited and prosecuted suspects accused of killing U.S. federal agents in the past . Read more : Colombia arrests fake nuns with cocaine under their habits .
Six Colombians accused of operating a robbery and kidnapping ring out of cabs . The men were arrested in the Colombian city of Cali on Tuesday after police found more than $800,000 (£670,000) hidden inside their cabs.