Billy McPherson was the husband of Margaret McPherson, the patient in Massage Therapy. He was portrayed by actor Zachary Knighton. Billy came home one day and found a very upset Margaret, who was worried that there was someone in their house. However, she soon started vomitting and Billy rushed her to the hospital. However, House eventually realized that Margaret was hiding the symptoms of schizophrenia and started treating her with anti-psychotics. She was soon lucid and had to admit to Billy that she was lying to try to hide her condition.