Chicago Med Season 10, Episode 9 "Broken Hearts" does very little to set up the upcoming One Chicago crossover ... killing off Robert Sullivan, a.k.a. "Sully," Ripley's childhood friend and ...

The character suffered the loss of a friend, Sully (Daniel Dorr), in the episode right before the crossover. We even see Ripley returning from Sully's funeral at the beginning of the crossover.