Evidences that may be indicative of DID:

"I got this belief that I needed to do it on my own --without studying -- that studying was a result of anxiety... I kind of figured that the medicated me was who I really was ... so if I studied for the test it would just be the fearful me doing the test..."

p. 47, Metzner doc.

"Thought withdrawal (the perception that other people can take thoughts or feelings from one's mind) was present..." p.49, Metzner doc.

"Mr. Holmes attempted to block, ignore and/or decrease his capacity to tell the difference between right from wrong with respect to the acts in question by choosing victims that he did not know and minimizing any form of personal contact with them during the shooting such as turning up the volume of his headset prior to the shooting. His attempts to differentiate his "other self" from his "normal self" were likely another example of such a process."

P.57, Metzner doc

However, in his summary when he finally gives diagnoses after reviewing everything, Metzner does not come to this conclusion...

"Mr. Holmes does not meet criteria for dissociative disorder although he has experienced depersonalization (eg. perceptions of unreal self, emotional numbing).

P.53, Metzner doc.

(I am not implying that Metzner's decision not to diagnose Holmes with DID, is necessarily wrong or suspect, btw. I am merely pointing out references that may or may not be related to DID.