Mysterious death of Yevgeny Prigozhin was 'certainly not a mechanical failure of any sort'

The head of the mercenary Wagner group , who led a military rebellion against Vladimir Putin two months ago, is presumed dead after a mysterious plane crash in Russia. Former CIA Director John Brennan and Richard Engel join Andrea Mitchell to discuss the latest. “There was still going to be, I think, a fair amount of investigation analysis done on what was the cause of that crash, but it was not certainly a mechanical failure of any sort. It was a catastrophic explosion that took place while it was at that altitude,” Brennan said.  » Subscribe to MSNBC: Follow MSNBC Show Blogs MaddowBlog: ReidOut Blog: MSNBC delivers breaking news, in-depth analysis of politics headlines, as well as commentary and informed perspectives. Find video clips and segments from The Rachel Maddow Show, Morning Joe, The Beat with Ari Melber, Deadline: White House, The ReidOut, All In, Last Word, 11th Hour, and Alex Wagner who brings her breadth of reporting experience to MSNBC primetime. Watch “Alex Wagner Tonight” Tuesday through Friday at 9pm Eastern. Connect with MSNBC Online Visit : Subscribe to the MSNBC Daily Newsletter: Find MSNBC on Facebook: Follow MSNBC on Twitter: Follow MSNBC on Instagram: #Russia #Ukraine #Putin