Apparently the Bus driver was the pilot not Randy, as I have thought over the years.
One report from a band member witness on the ground said in the last seconds of the flight there seemed to be some kind of struggle going on in the front seats when the plane started wobbling and clipped the bus rooftop.
The pilot was 58 years old and may have had a heart attack. Just my guess................
I heard he was aiming the plane at his x-wife who was on the tour.