Aurora suspect sent ominous letter
The suspect in the Aurora, Colo. shooting that left 12 people dead and 58 injured sent a letter to the University of Colorado Anschutz Medical Campus that threatened a shooting and even included pictures -- but the letter sat unopened until Monday, CBS News has learned. Watch John Millers' full report on the "CBS Evening News" at 6:30 p.m. ET/PT.
