"The Brain Surgeon" Investigation was a minor police investigation that occured in the final season of DEXTER. It was a Miami Metro Homicide investigation into a Serial Killer known as "The Brain Surgeon", and there were only two identified victims prior to when the killer's identity was revealed (both of which had their craniums sawn into and a portion of their brains removed). Lyle Sussman was the initial and primary suspect in this investigation, though, unbeknownst to the police, the true killer had used Sussman as a patsy and later murdered him himself, staging Sussman's death as a suicide in order to avoid further investigation from the police. After this, the case was officially closed and had received no mention for a long while (the police believed that Sussman was "The Brain Surg