So yeah...
this happened. Sent some pics to my tree hugging former baggage handler down in Florida & he said "...internal heart rot, making the tree brittle. No cure for it." So, now I have to get that massive branch cleaned up, then take the rest of the tree down
No one in the house heard it fall except the dogs, and since it was dark, The Bitch just assumed the dogs were being assholes barking at nothing.
The almost-step-son-in-law is working on getting a chainsaw & some other equipment. FML.