Wagner mercenary group chief Yevgeny Prigozhin¡¯s death in a plane crash last week was confirmed by Russian investigators, as speculation over a possible Kremlin-ordered execution continues to swirl.

DNA tests showed that all 10 passengers and crew listed as having boarded the private jet on Aug. 23 were killed, according to a statement on the Russian Investigative Committee¡¯s website Sunday.

Prigozhin led a failed mutiny in June against Vladimir Putin¡¯s military leaders that threatened the Russian president¡¯s nearly quarter-century grip on power. The U.S. has said the plane crash may have been an assassination approved by Putin himself, suggestions that the president¡¯s spokesman Dmitry Peskov dismissed as ¡°an absolute lie.¡±