I saw this on another forum.
He was found locked inside the trunk of a submerged car in Gulf Shores, Alabama. He had been missing for over a year at that time.
Here's that story:
https://news.google.com/newspapers?n...,2281581&hl=en

There was a follow-up article a year later (1988) saying that 'leads had surfaced,' but this remains an unsolved cold case to this day.
https://news.google.com/newspapers?n...,1419325&hl=en