MILLS PUSHES TO LEARN THE REAL STORY OF HIS FATHER’S DEATH—TREAT WILLIAMS GUEST STARS—With tensions still running high between Chief Boden (Eamonn Walker) and Bennie Severide (guest star Treat Williams), things boil over when Mills confronts Bennie about the fire that killed his father. Meanwhile, Severide (Taylor Kinney), Casey (Jesse Spencer) and Bennie uncover the truth behind two mysterious diner fires and Shay (Lauren German) takes a new direction with her plan to have a baby. Monica Raymund, Charlie Barnett and David Eigenberg also star. Chaon Cross guest stars.
CHICAGO FIRE airs Wednesdays on NBC (10-11 p.m. ET).