One of the brothers nicknamed the "Milli Vanilli" bandits for wearing long-haired wigs during some of their robberies was found guilty Tuesday.
Jeremy Ervin, 35, was found guilty of two counts of aggravated robbery and two counts of violent crime.
He'll be sentenced in June.
His brother, Derrick Ervin, 33, pleaded guilty earlier and is serving a 10-year sentence in the Colorado Department of Corrections, according to the Denver District Attorney's office.
The brothers were accused of robbing more than a 15 businesses, including fast food restaurants and a dollar store, beginning in 2013.