Scheduled to return to the Octagon in Brasilia, Brazil on September 13 against Paulo Thiago, veteran Joe "Diesel" Riggs's first UFC bout since 2006 has been put on hold after an accident at Riggs' home in Arizona Monday night.

The UFC released the following statement on the incident.

“We were made aware that newly-signed UFC competitor Joe Riggs was involved in an unfortunate accident last night. While clearing his permitted firearm (a pistol), the gun discharged, injuring his hand and upper thigh. Riggs was transported to a nearby hospital in Arizona where he is being treated by physicians. We wish Joe a speedy recovery.”

Texas welterweight prospect Sean Spencer, winner of two of his last three, has verbally agreed to step in for Riggs against Thiago.