The investigation culminates in a tragic showdown. Chief O'Neal, realizing the depth of his son's crimes, shoots Sean and then himself.
You can watch the full series or catch up on specific episodes like this one through the official Chicago P.D. page on Peacock or check for episode discussions and reviews on platforms like IMDb and Rotten Tomatoes . Chicago Police Department S10E09 VOSTFR HDTV
Upton has been hyper-focused on this case as a way to distract herself from the emotional void left by Jay Halstead’s departure. Her fixation leads to a tense confrontation with Sean, who attempts to manipulate her by highlighting her own "brokenness". The investigation culminates in a tragic showdown
While the Chief dies, Sean survives the shooting. Voight intervenes to ensure Upton does not let Sean bleed out, protecting her conscience even though it leaves the villain alive. Technical File Info page on Peacock or check for episode discussions