Emily - She said that she was in the Set Control Room, but according to Robert's interrogation transcript - that room was sealed.

Victor - He said that he was in Studio 4, but he would have required a keycard to access that area. The only other way to get to Studio 4 is through Studio 2 - but that area was closed according to the Email.

Victor was the killer. On his third interrogation, he finally confessed.

Evidence: During his second interrogation, he mentioned "strangling". It was never made public that Olivia was strangled. According to the Filming Schedule, Victor was supposed to be working setting up props in Studio 4 at the time of the murder. According to the email that Robert sent out, anyone working with props has to wear gloves while working. This means that Victor had gloves with him when he went to see Olivia.