This month’s Titan FC 32 card has seen a change in its championship main event.

Dave Herman (22-6) is out of his fight for the vacant heavyweight title against fellow UFC vet Jon Madsen (8-1). Instead, another UFC vet, Jack May (7-2) will move up the card into the title fight.

Titan FC officials announced the change today. Titan FC 32 takes place Dec. 19 in Lowell, Mass. The event’s main card will air live on the Titan’s current broadcast partner, CBS Sports Network. Desmond Green meets Steven Siler in the co-feature for the vacant featherweight belt.

May suffered the first two losses of his pro career earlier this year, both in the UFC. In April, Derrick Lewis stopped him with a first-round TKO, and in August, he was stopped by Shawn Jordan at UFC Fight Night 47.

May was scheduled to fight Lew Polley (12-5) at Titan FC 32. There was no immediate word from Titan on Polley’s new opponent, or if he will remain on the card.

Madsen came out of Season 10 of “The Ultimate Fighter” and started his UFC career 4-0 with decision wins over Justin Wren, Mostapha al-Turk and Karlos Vemola. Then he knocked out Gilbert Yvel to stay perfect at 7-0. But he was cut by the UFC after a TKO loss to Mike Russow in March 2011 that came after a doctor’s stoppage. Madsen stayed away from competition for nearly three years before returning in March with a 48-second knockout win in regional action, and now he gets a title fight in his Titan debut.

Herman snapped a four-fight skid earlier this year in his promotional debut at Titan FC 28 when he took a unanimous decision from Kalib Starnes. He was his first win in nearly three years. Herman won his UFC debut with a “Fight of the Night” win over John-Olav Einemo. But then he had four straight stoppage losses with knockout setbacks against Stefan Struve, Roy Nelson and Gabriel Gonzaga and a submission loss to Antonio Rodrigo Nogueira – a virtual murderer’s row of UFC heavyweights.

With the change, the latest Titan FC 32 card now includes:

Jon Madsen vs. Jack May – for vacant heavyweight title

Desmond Green vs. Steven Siler – for vacant featherweight title

Rick Hawn vs. TBA

Lew Polley vs. TBA

Wayne Ahlquist vs. Nate Oses

Ryan Quinn vs. Milan Zerjal

Nick Honstein vs. Iliarde Santos

Nick Drummond vs. John Ortolani

Andre Harrison vs. Aaron Neveu

For more on Titan FC 32, stay tuned to the MMA Rumors section of the site.