What is the turning point?

When Cameryn sneaks into Dr. Jewel's hotel room to search for evidence, she hides under the bed when Dr. Jewel returns to the room and she overhears him talking about a car rental on the phone, which disproves his alibi. Unfortunately, Cameryn's phone rings as Dr. Jewel leaves the room and hearing it, he returns with the intentiom to kill Cameryn, confessing he became Christopher Killer to ensure the success of his television show.