The return of Ruzek, played by Patrick John Flueger, in the latest episode of Chicago P.D. marks a significant moment for the show and its fans. Ruzek's absence, which lasted from Episode 5, was a result of Flueger taking a leave of absence to address a personal matter. This break from the series was unexpected, prompting the rewriting of scripts to account for the character's absence. The episode reveals a heart-wrenching story behind Ruzek's departure: he had to be by his father, Disco Bob's, side as he battled Alzheimer's. The revelation of Disco Bob's terminal condition adds a layer of emotional depth to the narrative, highlighting the personal struggles faced by the characters. The episode also delves into the ongoing challenges faced by Ruzek and his wife, Kim Burgess, as they navigate their lives and the potential relocation of their adopted daughter. The return of Ruzek is not the only significant change in the show this week, as the spin-off series Chicago Fire also bids farewell to a long-time character. The episode's exploration of personal struggles and the impact of Alzheimer's on the characters adds a layer of emotional complexity to the show, making it a compelling watch for fans. The return of Ruzek, despite the personal challenges he faced, is a testament to the resilience of the characters and the enduring nature of the show's narrative. The episode's focus on the emotional impact of personal struggles and the challenges faced by the characters adds a layer of depth to the show, making it a must-watch for fans of the series. The return of Ruzek is a significant moment for the show, and the emotional depth added to the narrative through the exploration of personal struggles and the impact of Alzheimer's on the characters makes it a compelling and thought-provoking episode.