Although Connor hurriedly took over compressions and tried to get all the nurses (and Ava) in the room to keep working on his dad, Ava said that he’d already been down for ten minutes before he showed up.
Apparently, it was not just Cornelius’ heart condition that resulted in his death in “Forever Hold Your Peace.”
The episode didn’t show what happened leading up to Cornelius beginning to flatline; he was already gone by the time Connor arrived at his room.
She pronounced him dead.
…
Chicago Med 4x22 Promo "With A Brave Heart" (HD) Season Finale