Not likely. Dressed in black, with a riot mask and bullet proof vest. Seems more like a loner psycho.
Reports now of at least 2 gunmen:
http://www.rt.com/news/shooting-dark-knight-rises-batman-denver-aurora-654/
“...Local media reports that two gunmen were involved in the rampage. An explosive device was set off during the shooting, injuring several people...”
Aurora PD reports 50 transported to local ER’s.
http://www.radioreference.com/apps/audio/?action=wp&feedId=43
Could be a loner but not if the report of 2 shooters is accurate.