Gary Sinise Unit Chief Jack Garrett Actor Alana De La Garza Clara Seger Actor Daniel Henney Matthew Simmons Actor Tyler James Williams Russ "Monty" Montgomery Actor Annie Funke Mae Jarvis Actor Kirsten Vangsness Garcia Guest Star Tarnue Massaquoi Tumo Makani Guest Star Mason McNulty Nicholas Guest Star Erica Piccininni Rebecca Guest Star Adetokumboh M'Cormack Gervas Guest Star Steve Kazee Elijah Ward Guest Star James Thomas Gilbert Jacob Ross Guest Star Sherry Stringfield Karen Garrett Guest Star Matt Cohen Ryan Garrett Guest Star Andrew Fox RJ Garrett Guest Star Jayden Bartels Emma Garrett Guest Star Marc Marosi Father Barton Guest Star Kelly Frye Kristy Simmons Guest Star Ezra Dewey Jake Simmons Guest Star Declan Whaley David Simmons Guest Star Afemo Omilami Inspector Polino Guest Star Emmanuel Jean-Joseph Rebel Guard Guest Star Lawrence Adimora Dacaad Kaar Guest Star Elizabeth Leiner Sarah Ross Guest Star Stephen L. Sullivan John Guest Star Mark Gordon Executive Producer Erica Messer Executive Producer, Writer Nicholas Pepper Executive Producer Alec Smight Director Adam Glass Executive Producer