Was it someone you knew, Bruce?
The track log didn't look that odd to me, although I see the last eight minutes had a bunch of turns.
https://www.flightaware.com/live/flight/N690BM
I did not know them and had not been around the plane. About 4 years ago, however, they contacted me about finding the plane a new home and it seemed as though both the pilot and the owner were ready to retire. I understand that the pilot I spoke with retired and the owner since died but his son was flying the plane. RIP.
As I recall, at the time, the plane was a mostly stock plane with original style avionics.
On that audio, when he asked for higher, the hair on the back of my neck stood up.
I wonder what the tops were in the area?