MMA Weekly has the info.

Following a rocky time in the Ultimate Fighting Championship, capped by a surprising knockout loss to Octagon newcomer Junior dos Santos at UFC 90, Chute Boxe fighter Fabricio Werdum has left the promotion.

Sources tell MMAWeekly.com that Werdum's exit comes on the heels of a failed contract renegotiation following the loss to dos Santos. The Brazilian came into the fight with the expectation that he would soon be contending for a heavyweight title shot.

I would have like to seen him have 1 "bounce back" fight in the UFC before totally writing him off. Flash knockouts can happen to anyone. But it seems that the UFC is not willing to invest HW fighters unless their names are Lesnar, Couture, Mir or Noguera. Let's hope Shane Carwin and Cain Velasquez never get KOed.