Morbid circumstances, but a welcome return nonetheless. The middle seasons of Chicago PD were rough on the original cast.

The first three-hour crossover in more than five years unites the crews from 'Chicago Fire,' 'Chicago P.D.' and 'Chicago Med.

The confirmed Chicago PD season 12 cast are is follows. The official NBC synopsis for Chicago PD season 12 reads: "Chicago PD is back for an all-new season as the Intelligence Unit continues to ...