Sorry to hear this, and it just hit home as well, I just recently changed the rack-n-pinion and tie rod ends on my wife's mustang, I ran it up on ramps, chalked the rear wheel, and proceeded to remove all the bolts and lines to the rack and loosen the tie rod jam nuts, last item left, was the tie rods themselves, and needed to remove the wheels for this part, jacked up the passenger wheel, secured with a jack stand after removing the ramp out of the way, removed the wheel and tie rod, went to the drivers side, jacked it up, removed the ramp, placed a jack stand underneath, proceeded to loosen the nut on the tie rod to the spindle, and pulled the car off off everything towards me, I jumped back approx 3 feet, the car came down to about within 4" from the concrete...I was less than a minute from getting under the car.................................I re-jacked up the car and secured it, had to go into the house for about a half hour to reflect and regain my nerve to get under the car, first time in 30+ years of working on cars, I almost always always always-and had to say almost because this is the first time I didn't, was to slide the removed wheels under the car just behind the wheel well to prevent the car from dropping very far should this happen, don't know why I didn't this time, but had it fallen while I was underneath, the wheels would have prevented me from being crushed, so, it's never too late to be reminded about safety, again, sorry for the loss and and prayers to the family.
