There has been absolutely nothing else matching him to the Joker. Besides red hair, when the Joker is known for green hair.
The only thing tying him to the Joker is that one anecdote relayed by the police chief of NYC.
His hair was painted red, the same hair color of Heath Ledger's Joker at one point in 2008's "The Dark Knight."
his hair was painted red in an ode to the Batman villains sinister clown appearance
there was the Heath Ledger death,
.. Aurora and Ledger each involved the Joker, or at least men who embodied the character and the qualities of the Batman comics villain.
Holmes' delusions are hardly the last of it, as it's been noted that the massacre was reminiscent of two moments from the groundbreaking comic book "The Dark Knight Returns."
The 1986 Batman story shows a crazed man with a gun who strolls into a *advertiser censored* theater, with the final panel of the scene depicting a TV reporter saying, "Three slain in Batman-inspired *advertiser censored* theater shoot-out
In the same story, The Joker makes an appearance on a talk show during which he unleashes a bomb that emits deadly gas before telling the audience he's going to kill them all.
according to an Aurora Police Department press release, and subsequently told police that there might be explosives in both his home and his car. But the information he gave was only partially true, as there were no bombs in his car.
In the 2008 film "The Dark Knight," The Joker goes on a deadly rampage, allows himself to be arrested, and subsequently tells Batman there are explosives in two different locations. But the information he gives is only partially true, as he lies about which hostage is tied up at which location
. A similar, now haunting, scene unfurls in "The Dark Knight Rises" when a masked villain leads a violent gang into a packed football stadium and deploys guns and explosives on the unsuspecting crowd.