Who's the Scream Queens Killer? The Latest Theories

Why he might be the killer:

• He's the standard unpopular Greek-hater (and also was rejected by Chanel the previous year) . . . and he has the killer's costume in his closet. Plus, the camera seems to linger on him making creepy expressions at people.
• He's flying so perfectly under the radar that it could so be him.

Why he might not be the killer:

• The costume could just be the mascot costume, like he insists, and it's so obvious that it's him that he's a total red herring.
• He seems very dedicated to solving the crime . . . then again, that's a great cover.