Joelle Carter

Alexis asks Castle for help proving a death row inmate's innocence 72 hours before his execution, but they uncover a secret that could seal the man's fate.

Through Lexie, Meredith tries to get Derek interested in a patient's rare brain tumor; Callie ends up being annoyed when Mark and Arizona finally form a friendship.

A college coed is murdered and the crime is meant to look like a rape, though it is later proven that no sexual assault took place. Briscoe and Curtis soon learn that the student was part of a campus call-girl ring and go to arrest the "madame" - who has fled the country. McCoy and Kincaid then target the madame's father, who has helped his daughter work her way through college. Cara Buono (Next Stop Wonderland) and Jame Naughton (The Cosby Mysteries) guest stars.

After a hooded man open fires on their patrol car, Roman (Brian Geraghty) is left wounded and Burgess (Marina Squerciati) takes off after the shooter, briefly losing sight of him, and shoots when she relocates him turning in her direction with a glimmer of silver in his hand. No gun has been found at the crime scene and the shooter is identified as a 17-year-old honor student who will likely never walk again due to his injuries. Protests begin as the public views the case as another incidence of a police officer shooting an unarmed African American teenager. Assistant State Attorney Peter Stone (guest star Philip Winchester), the same man who sent Voight (Jason Beghe) to prison, has been assigned to help defend Burgess and conduct his own investigation under the supervision of State Attorney Mark Jefferies (guest star Carl Weathers). Stone and his team need to collect enough evidence to indict the teen and clear Burgess, but must tread with caution on this high profile case as tensions run high.

When Monk's insurance company refuses to pay for more individual therapy sessions, Monk joins Dr. Bell's therapy group, where somebody appears to be murdering his fellow patients. Tim Bagley and Hector Elizondo guest star.