Guest Stars Samuel Hunt as Craig "Mouse" Gurwitch Nick Gehlfuss as Dr. Will Halstead Markie Post as Barbara "Bunny" Fletcher Kevin J. O'Connor as Commander Fischer Josh Segarra as Justin Voight Oliver Platt as Dr. Daniel Charles Madison McLaughlin as Michelle Sovana Dash Mihok as Jeff Frazier Co Starring Chris Agos as Assistant State's Attorney Steve Kot Melissa Carlson as Meredith Olinsky Caroline Neff as Olive Morgan Voight Alina Taber as Lexi Olinsky Mark Allan Stewart as James Beckett Steve Wojtas as SWAT Leader Carson Hicks Laura Obenauf as Business Woman Poppy Golland as Amanda Nova Gaver as Teen Girl Myles Gillespie as Bodyguard Andres Enriques as Randy Lily Wren Henderson as Lacy Collins Dano Duran as Cabbie Victor Almanzar as Oscar Mena Robert Cornelius as Ken Aysette Munoz as Carolina Lindsay Stock as Sarah Frazier Ryan Bourque as Trevor Daniela Colucci as Julia Higgins