AP/Getty On Wednesday, Russian officials said Wagner Group leader Yevgeny Prigozhin died in a plane crash. An aviation expert laid out to Insider what investigators would look for in terms of evidence. That's provided that a fair investigation can happen, given Prigozhin's failed rebellion. The plane said to be carrying Wagner boss Yevgeny Prigozhin to his demise appeared to be engulfed in flames at the crash site, which could give investigators immediate clues as to what happened during the flight's last moments, an aviation expert who analyzed a purported video of the crash told Insider.On Wednesday, Russian state media reported that Prigozhin was among ten passengers who died after their business jet crashed in the Tver region outside of Moscow.RIA Novosti shared a video, claiming that it showed the airplane in descent before it hit the ground.