Head Case

Head Case is the third episode of the fourth season of the American crime drama television series Castle. Written by David Grae and directed by Holly Dale, the episode first aired on October 3, 2011.

Plot summary
A murder scene complete with lots of blood, but no victim, and high tech life extension science are all part of the investigation, as Castle and Beckett try to solve a murder without a body. Meanwhile, Alexis waits to hear news about her application to Stanford.