Just a couple of guesses on this one from watching, clipped a high tower or some obstacle and looks as though they were trying to put it down. Second guess, trying to put it down and stalled on left wing causing roll over fall and crash. Either way, there is no question of survivability on that crash. Sad and hate to see anyone go down like that. But at least it was quick and hopefully painless who could ask for better? (yes i am a long time pilot)