When we last saw Antonio Dawson on “Chicago P.D.,” he was coping with an addiction to pain medication. Dawson is first prescribed the pills while he’s rehabbing a shoulder injury during Season 6. While the injury heals, Dawson keeps taking the pills and then obtains more through illegal channels. It initially doesn’t seem like a big deal to his colleagues, but eventually, Dawson’s drug-induced rage gets the better of him. He murders one of the men who has kidnapped his daughter.
Dawson tries to take the blame for the crime. Still, Hank Voight (Jason Beghe) arranges for him to be spirited off to rehab before anyone can figure anything out about the extralegal murder he’s committed. He resigns off-screen and eventually moves to Puerto Rico. Gabriella Dawson (Monica Raymund) from “Chicago Fire” makes a brief appearance on “Chicago P.D.” during Season 7 to say that Antonio is now working as a crisis response team member in the Bahamas, indicating that he has passed a drug test and is officially sober. Antonio himself stays off-screen and doesn’t return to Chicago — and fans of the drama will have to keep watching to see if he ever risks returning to the city.