CHICAGO FIRE Season 3 Episode 12 Photos Ambush Predator : SURPRISING EVIDENCE IS UNCOVERED THAT SHEDS NEW LIGHT ON THE FIRE THAT KILLED SHAY–RICHARD ROUNDTREE GUEST STARS–Severide (Taylor Kinney) and Dawson (Monica Raymund) discover startling evidence found at a storage unit fire that appears connected to the fire that took Shay’s life. Meanwhile, the firehouse bands together when Chaplain Orlovsky (guest star Gordon Clapp) is the victim of a bad car accident. Elsewhere, Chief Boden’s (Eamonn Walker) father (guest star Richard Roundtree) visits, but quickly wears out his welcome with his unsolicited parenting advice. Jesse Spencer, Kara Killmer, Charlie Barnett, David Eigenberg, Yuri Sardarov, Joe Minoso and Christian Stolte star. LaRoyce Hawkins, Randy Flagler and Melissa Ponzio guest star.