Yeah, that's bad stuff, sorry to hear that. RIP.
My daughter-in-law, and the mother of my grand daughter, is a crew chief on a black hawk for the WV NG. I've never really worried about this sort of thing, but it happens. It'll make me think twice now.
I was just talking to my son about this and he said my DIL heard about it as soon as it happened. She said that they're speculating maybe a tail rotor failure. She said that the "Crash Hawks" have a reputation for that. She also said that her unit just recently got new birds. Their old ones were from the 1990's.