Season 3 Episode 15

full size Investigations Underway in 3.15 "The Final Nail"
Credit: ABC

Title: The Final Nail
Air Date: February 15, 2011 at 12:00 AM PST

Castle's old school chum is accused of murdering his wife, and Castle and Beckett are at odds over whether the man is innocent or not. Original air date: February 14, 2011. Read the full recap here.