CSI: Miami Episode 9.20 Paint It Black

Monica Dow, a prominent art student, is the main suspect of an on-campus murder when her roommate, Corinne Palmer, is found dead in the university spa. Upon further investigation, Horatio discovers that Monica suffers from a cognitive disorder where she blacks out and when she wakes up she becomes a different person. Something so traumatic in Monica's past forces her to suppress her pain by creating an alter. Our victim's boyfriend also raises suspicion and we learn that Monica seduced him. Things get even more chaotic when Monica is attacked only to have our team discover that it was self inflicted by her original traumatized self, Alexis. Corinne was trying to help Monica/Alexis cope with her disorder but that would affect her art and that didn't bode well for Monica/Alexis' professor who had the most to gain by keeping Monica/Alexis sick.