Yevgeny Prigozhin was a longtime ally of Russian President Vladimir Putin before staging a failed mutiny against the Russian defense ministry in June 2023.Getty ImagesWagner Group leader Yevgeny Prigozhin is presumed dead after his plane crashed on Wednesday.His apparent death comes two months after he staged a failed mutiny against the Russian military.Security officials and Soviet experts believe Putin is likely behind Prigozhin's death.