Well hot diggity... I've found the article with the headline that reads "Duncan Bank Robbers Sentenced". Seems Joe Hale and J. F. Mack were involved and implicated Ira Greer as the instigator. You can find this article as well as the initial article at the Library of Congress, Chronicling America website, that has scanned newspapers. http://chroniclingamerica.loc.gov/
The sentencing article is found in the Tombstone Epitaph, Feb 21, 1915. I did a search on Arizona, all newspapers, with the words Duncan bank robbery 1914.