MMAJunkie.com first reported the news late Tuesday and Barnett later confirmed the report via Twitter.
"The War Master" first made his Octagon debut in 2000 with a perfect record of 10-0, before stopping Gan McGee, Semmy Schilt and Bobby Hoffman. At just 24-years-old, Barnett went on to stop Randy Couture on strikes to capture the UFC heavyweight title, though was stripped of his belt after testing positive for banned substances.
Over the next five years, the submission expert would compete exclusively in Japan for the PRIDE FC promotion, scoring notable victories over Alexander Emelianenko, Mark Hunt and Antonio Rodrigo Nogueira. Barnett then signed with Strikeforce in 2011, where he earned back-to-back submission victories over Brett Rogers and Sergei Kharitonov. The 36-year-old came up short on points to unbeaten standout Daniel Cormier in the finals of the Strikeforce World Heavyweight Grand Prix Tournament.
In his most recent outing, Barnett submitted Nandor Guelmino under the Strikeforce banner, marking his ninth win in ten outings.
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