Sad to read about.. I always try to take extra precautions when working on equipment, including often not working on something when my wife is not home if it might be dangerous. An extra set of eyes or help can prevent some accidents.
Probably 10 years ago, I was working on Suburban. I had to replace the gasket under the oil filter adapter and had used floor jack to raise vehicle, even took time to put jackstand under in case floor jack had problem.. The floor jack leaked down a few inches until the jack stand was supporting the vehicle. It was enough that I could not move, I was stuck, but was ok (unless the jackstand failed).. One of my daughters came out to see how things were going and got me out..