Second-base umpire Jim Reynolds immediately ruled McGehee out. But McGehee thought he was safe and didn't leave the field.
Manager Mike Redmond, after getting the go-ahead from the dugout, issued a challenge.
"It was close and Casey was adamant. He didn't feel like he tagged him," Redmond said. "It took a while to kind of get a picture. It was inconclusive, I guess."
Various angles were shown. The Marlins felt Desmond's tag slapped the dirt and not McGehee's arm. Replay evidence wasn't as conclusive, and after a review of 2 minutes and 13 seconds, the ruling was that the call stands.
Redmond is now 10-of-12 in replay challenges.
Joe Frisaro is a reporter for MLB.com. He writes a blog, called The Fish Pond. Follow him on Twitter @JoeFrisaro. This story was not subject to the approval of Major League Baseball or its clubs.