Diagnosis Murder S08E04 - By Reason of Insanity

When George Lawson, a former medical student who of Mark's, was diagnosed with schizophrenia is found at a murder scene without an alibi, Mark, Jesse, Steve, and Steve have the large task of proving he had nothing to do with the crime. Through the course of their investigation, Mark discovers that the jilted wife of the man who was having an affair with the victim's wife knows more than she's letting on about what happened. As a result, they turn to George and his coded messages for help in solving the crime.