Sean Sherk hasn’t fought since midway through 2010, so most were probably not surprised when “The Shark” announced his retirement recently.

Sherk, who won the UFC lightweight title in 2008 with a victory over Kenny Florian, finishes his career with a record of 36-4-1. He was stripped of the title after testing positive for performance enhancing drugs.

During his UFC run, Sherk compiled an 8-4 record, including a loss to BJ Penn upon returning from suspension for the UFC title.

“Have to say thanks for all the great support I’ve had over the years,” Sherk posted on Twitter. “It’s been an honor and privilege fighting for UFC and all the fans.”