Ryo Chonan, who submitted Anderson Silva in 2004, has announced plans to retire from MMA.

Chonan (21-13) is the current DEEP middleweight champion and will defend his title in October against Dan Hornbuckle. The 36-year-old has been in MMA since turning pro in 2001.

Chonan defeated Silva via flying scissor heel hook at PRIDE Shockwave 2004. He fought four times for the UFC, going 1-3 and being released following a split decision loss to TJ Grant in 2009.

The win over Silva gained Chonan plenty of fame, as it was the “Submission of the Year” on many websites and scored one of the “Best Submissions of the Decade” by Sports Illustrated.