Former kickboxer and MMA coach Jeffrey “Duke” Roufus, who trained some legendary fighters, died Friday at the age of 55, according to business partner Scott Joffe.

Roufus died peacefully in his sleep, per Joffe.

“Duke was more than a celebrated trainer and champion kickboxer — he was a mentor, innovator, father and friend whose influence transformed the landscape of mixed martial arts,” Joffe, who partnered with Roufus for 29 years, wrote Friday on Facebook. “His knowledge, charisma and passion inspired countless fighters to reach heights they never imagined possible. From world champions to first-day students, everyone who crossed his path felt his genuine care and unwavering belief in their potential. His loss leaves an irreplaceable void in the sports and in the hearts of all who knew

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