Season 3 Episode 6

Title: 3XK
Air Date: October 25, 2010 at 12:00 AM PDT

When a beautiful woman is found dead in an alley, all clues point to her being a victim of the notorious Triple Killer. The Triple Killer, or 3XK, terrorized New York City four years ago, then mysteriously disappeared. Now he's back. In a deadly battle of wits, Castle and Beckett race against time to stop 3XK before he claims his next victims. Lee Tergesen of Oz (as Marcus Gates, a violent felon and prime suspect in the serial killer investigation) and Michael Mosley of Scrubs (Gates' former cellmate) guest star. Read the full recap here.

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