On July 7, 2008, we published photos by Warren V. of the mural on the Stone Avenue side of the Bates Mansion (283 N. Stone near Franklin).
Two days ago, the Arizona Daily Star article by Ernesto Portillo covered that mural, as well as two others (mostly the magnificent mural inside the mansion that's deteriorating). It said that the murals were painted by Mexican artist Salvador Corona, who was active in Tucson until the 1990s.
Here's the other mural that the article mentioned; it's over the north entrance. You might not call it a “mural” because it's not paint on a wall. I grabbed a photo of it on Sunday so you can make up your own mind: