Who was this musician?

I’m trying to remember the name of this deceased musician. Excuse me if I get some details wrong. He was either in a 60’s or 70’s band. He later worked in the computer/electronics industry. While on a business trip, he went missing. Years later, his body and van were found near a river. A segment on “Unsolved Mysteries” was done on him.

Any help would be greatly appreciated.

I think you’re thinking of this guy from Iron Butterfly.

Iron Butterfly, Michael Jackson’s brother, FTL communications.
This is an April Fool’s thing, right?