Mary's therapist who monitors her mental state and investigates her drug test results. He suspects parasomnia and observes Stephen walking during a video call. He rushes to the house during an ice storm, arrives too late, and is stabbed by Stephen before advising Mary to play along with Stephen's delusions.
Dr. Wilson provides psychological support and medical oversight for Mary's deteriorating mental state.
Dr. Wilson is the primary medical authority monitoring Stephen's supposed condition.
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