Emmett Rogers Fightmaster, known professionally as E.R. Fightmaster, is most known for playing Dr. Kai Bartley in seasons 18 and 19 of Grey's Anatomy - a historic feat, as they portrayed the show's first nonbinary character in a recurring role. Though Fightmaster last appeared on Grey's Anatomy in 2023, their role in the medical drama has resurfaced amid a rumored romance with costar Caterina Scorsone. The pair's characters briefly sparked a beloved romance on Grey's, making their IRL connection even more exciting for fans. Keep scrolling to see everything to know about Fightmaster: Who Is E.