ER attending physician at County General, Season 1.

Set during Episode 19, “Love’s Labor Lost.”

After insisting on managing a complicated labor himself, Mark makes a critical error in judgment that leads to the preventable death of a pregnant patient and her baby. The weight of that decision haunts him.

At the same time, his marriage is falling apart, leaving him emotionally isolated. Calm on the surface and quietly unraveling underneath, Mark carries his guilt in silence, replaying every choice he made and wondering when — or if — he stopped being the kind of doctor people could trust.