Big John McCarthy Opens Up About Stepping Away From the Octagon

When you think of the early days of mixed‑martial‑arts, a familiar voice you hear is John "Big John" McCarthy’s calm, authoritative commands from the cage. He was there at UFC 2, scribbling the first set of rules on a napkin‑sized sheet of paper, and later helped forge the Unified Rules of MMA that still shape the sport today.

In a candid interview this week, McCarthy finally gave fans the long‑awaited answer to a question that’s been buzzing around fight forums for years: why he isn’t stepping back into the octagon as a referee. The short answer? His body and his heart are telling him it’s time.

At 66, the former Nevada State Athletic Commission commissioner admits the physical toll of sprint‑ing across the canvas, dropping to the mat, and keeping a watchful eye on 15‑minute battles is no longer as easy as it once was. "I get sore just walking up the stairs now," he laughed, adding that the occasional twinge in his knees and a growing case of arthritis make the job feel more like a marathon than a sprint.

But it isn’t just the aches that pushed him out. McCarthy says he wants to give the next generation of officials a chance to grow without feeling like they’re standing in his shadow. "The sport is evolving, the athletes are faster, the rules are more nuanced – it’s a whole new game. I think it’s healthy for fresh eyes to take over," he explained.

Beyond health, family has taken center stage. After decades of jet‑setting between Las Vegas, Abu Dhabi and countless smaller venues, he finally has the luxury of watching his grandchildren’s first steps without worrying about a next fight call. "I’m still around the gym, I still love the sport, but I’m happy to be a mentor now rather than a referee," he said, hinting at occasional guest‑commentary gigs and a new role consulting on rule‑book updates.

In short, Big John’s departure from the cage isn’t a goodbye to MMA; it’s a shift from the front‑line to the sidelines, where he can still shape the game he helped create—just from a less bruised perspective.