With that musical build up, I was half expecting a scary face to pop up at the moment of the impact. Sorry about your loss, I hope you where able to salvage all of your gear. Looks like a good time to pick up a Bixler!
It looks like that was elevator failure...it nosed over to inverted, then into the death spiral...Maybe a brownout? Reciever failure? Bad servo? That's a tough one to call. At any rate, very sorry to hear about your plane. Hopefully the FPV gear was salvagable.