By Mariano Castillo and Chelsea J. Carter, CNN
(CNN) - James E. Holmes is described by those who know him as a doctoral student who is clean-cut, quiet and responsible, an image difficult to reconcile with the same man who police allege opened fire in a crowded movie theater.
Days after the 24-year-old was arrested on suspicion of a mass shooting at the Century 16 multiplex in Aurora, Colorado, the portrait of Holmes that is emerging is as limited as it is confusing.
Pictures obtained of Holmes show a bright-eyed young man, who is tall with dark hair, which contrasts the description of the man by a law enforcement official who said he dyed his hair red and identified himself as "the Joker" to authorities after he was arrested early Friday morning for allegedly shooting people during a screening of the new Batman movie.
By all accounts, Holmes is a bright student. He entered the University of California, Riverside, in 2006 as a scholarship student and graduated with highest honors with a bachelor's degree in neuroscience in 2010.