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By Kombatnet
Grigory Ponomarev dies at 31 from a blood clot.
Grigory Ponomarev, former heavyweight champion of AMC Fight Nights, died suddenly on September 20 at just 31 years old. The news of the Russian fighter's death was confirmed by Fight Nights itself and by the Russian MMA Union, while the first details about the possible cause of death emerged in the following hours.