"It was a very dark day when Strikeforce was sold," said Shamrock on The MMA Hour.
In the early days of the UFC, Shamrock held the company's light heavyweight championship and in Strikeforce was the middleweight champion. In both companies, he was the first to hold said championships.
"I think it's because we had fought so hard against the unbeatable adversary the UFC," said Shamrock. "I had so much personally invested in the vision, dream or chance of Strikeforce. It was my whole life. That's all I did."
Popular VideoThis young teenage singer was shocked when Keith Urban invited her on stage at his concert. A few moments later, he made her wildest dreams come true.
After going 1-2 under the Strikeforce name, Shamrock retired in 2010 following back-to-back losses.
- TUF Not In "Make-Or-Break" Year According To Dana White
- Clay Guida Adamant He Defeated Gray Maynard
- Shane Carwin, Roy Nelson Official For TUF 16 Finale
- Fine, Suspension For Forrest Griffin Followed Positive Drug Test
- Dana White Laughs Off Bobby Lashley As Daniel Cormier's Opponent
- UFC On Fuel TV 5 Replay Draws Better Ratings Than Original Broadcast
Get more great MMA news and analysis over at Fightline.