Super middleweight contender Andre Dirrell withdrew Monday from his fight next week against Blake Caparello because of undisclosed medical reasons, Premier Boxing Champions said.
The scheduled 10-round fight was due to take place Oct. 17 at the EagleBank Arena at George Mason University in Fairfax, Virginia, and be televised as the co-feature on NBC (4 p.m. ET).
The main event is a welterweight fight between former junior welterweight titlist Lamont Peterson (33-3-1, 17 KOs), who is from nearby Washington, D.C., and 2008 Dominican Olympic gold medalist Felix Diaz (17-0, 8 KOs).
Taking the place of Dirrell-Caparello will be a 10-round welterweight contest between prospect Prichard Colon (16-0, 13 KOs), 23, of Puerto Rico and Terrell Williams (14-0, 12 KOs), 31, of Los Angeles.
Colon brutally destroyed badly faded former junior welterweight titlist Vivian Harris in the fourth round of a junior middleweight bout in his last fight on Sept. 11.
Williams is coming off eight-round unanimous decision against John Williams on Aug. 27.
Also added to the card was junior welterweight Anthony Peterson (35-1, 23 KOs), Lamont's brother, who will face an opponent to be determined in a 10-rounder.
Middleweight Jimmy Lange (38-6-2, 25 KOs), the former contestant on "The Contender" reality series, will also be on the undercard.
He is from Great Falls, Virginia, and will be fighting for the 17th time at the EagleBank Arena, where he has regularly headlined small shows. He will face Mike Sawyer (6-4, 4 KOs) in an eight-round bout.
Dirrell (24-2, 16 KOs) was looking to rebound from a unanimous decision loss to James DeGale, in which he got knocked down twice, in a vacant super middleweight world title fight on May 23 in Boston.