Authorities say Montes was one of the "Grand Prairie Bandits," a crew responsible for nine robberies committed in 2006 in which assailants dressed in black and armed with large caliber pistols would take over the bank and threaten employees and customers. The robberies occurred in Arlington, Irving, Dallas, Grapevine and Cedar Hill and took less than one minute.
Montes and Margarito Armijo, 20, were convicted in April on eight counts of conspiracy to commit bank robbery, eight counts of bank robbery and 16 counts of using a firearm during a crime of violence.
Co-defendant Luis Favila, 20, plead guilty in September 2007 to nine counts of ban robbery an two counts of using a firearm during a crime of violence. Favila was sentenced in July to 42 years in prison.
Armijo was scheduled for sentencing next week.
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