Pittsburgh Steelers safety Ryan Mundy was fined $21,000 for his violent hit on Oakland Raiders wide receiver Darrius Heyward-Bey, according to an ESPN report.

The fourth-quarter, helmet-to-helmet collision left Heyward-Bey unconscious, until he was lifted onto a stretcher and taken to a local hospital. He was released the next day with a concussion and neck strain. He's expected to make a full recovery.

The injury happened as Heyward-Bey ran across the end zone for a pass from Carson Palmer. Mundy hurled his body and lowered his helmet into Heyward-Bey's facemask.

-- The Sports Xchange

SI Apps
We've Got Apps Too
Get expert analysis, unrivaled access, and the award-winning storytelling only SI can provide - from Peter King, Tom Verducci, Lee Jenkins, Seth Davis, and more - delivered straight to you, along with up-to-the-minute news and live scores.