Watch: Chicago Fire Loses 3rd Cast Member Ahead of Season 14Chicago's onscreen police force is temporarily down a member. Patrick John Flueger-who portrays Office Adam Ruzek on Chicago P.D.-is taking a step back from filming the current 13th season, multiple outlets reported. The sudden and unexpected leave of absence is reportedly due to a personal matter, and Patrick is expected to return later this season. No additional details have been confirmed. E! News has reached out to reps for Patrick as well as NBC for comment but has not yet heard back.