02/02/2013 (09:00PM - 10:00PM) (Saturday) : CRUZ STRUGGLES WITH GUILT OVER FLACO'S DEATH-Eaten up by his guilt over Flaco's death in the fire, Cruz (Joe Minoso) goes to Casey (Jesse Spencer) to confess. While Shay (Lauren German) recovers from a head injury sustained in the ambulance crash, Severide (Taylor Kinney) asks Dawson (Monica Raymund) for her help in dealing with his own injury. Casey is caught in The Middle of a family conflict between his mother (guest star Kathleen Quinlan) and sister (guest star Nicole Forester). Elsewhere, Herrmann (David Eigenberg) finds a business deal hard to stomach. Charlie Barnett and Eamonn Walk also star. Sarah Shahi guest stars.