The Silent Partner — Lee Goldberg

Dr. Mark Sloan, Community General Hospital's Chief of Internal Medicine, has been appointed by the LAPD to a special task force assigned to the cold case files--unsolved homicides long since abandoned by the police. One case concerns the murder of a woman who may have been a victim of the Reaper, a serial killer currently on death row. The police were unable to prove that the Reaper killed her, but there were enough similarities in the crimes to come to that conclusion. Until Mark Sloan reopens the file--and learns that the Reaper couldn't have possibly murdered this woman....

And that the real killer is still at large.