Chael Sonnen is hanging up his gloves.
The 17-year MMA veteran was scheduled to fight Vitor Belfort later this summer, but a new opponent will have to be found.
Sonnen is best remembered for his two fights against then-UFC Middleweight champion Anderson Silva, including their 2010 bout, in which Silva submitted Sonnen in the fifth round, with Sonnen ahead on all score cards, and narrowly missing out on the opportunity to end Silva's then-12 fight win streak, which he ran to 17.
Sonnen had regularly appeared on Fox Sports 1 as an MMA analyst, and is expected to continue his television commentary role.
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