Season 1 Episode 5

Title: A Chill Goes Through Her Veins
Air Date: April 6, 2009 at 12:00 AM PDT

A woman's body, frozen and tangled in steel bars, shows up at a construction site. Castle and Beckett struggle to get to the ice-cold heart of her murder, unearthing an old case in the process. As they zero-in on a prime suspect, painful memories from Beckett's past surface.