I think based on CU's talks and her name on the news...it is Angie Ribera or Angeles Ribera. She is a program director / professor for them. Google her name. Her picture was also shown in one of the news, wearing green shirt with short hair .
Found this older article about which labs JH was in:
http://the-scientist.com/2012/07/20/batman-shooter-is-former-neuroscience-student/
He appeared to be a normal guy, said a member of neuroscientist Nancy Zahnisers lab. I never heard him talk though, he added. Pretty quiet.
The researcher, who declined to give his name, said that Holmes was a rotational student, doing stints in different labs before settling in one to complete his PhD research. He noted that in March Holmes did a rotation in the lab of Mark DellAqua, who studies the role of kinase/phosphatase signaling complexes in channel and transcription factor regulation associated with learning, memory, and mental health disorders.