Jeremy was a typical " wally " in his day. If it's alleged he made such a remark as him " knowing what happened that night ",then he was just making out that he was the " know-all and big I am ", and nothing sinister. A " Billy Liar " if you like,to make himself recognised.What a pratt !
No doubt we've all met them. Always trying to go one better,especially if they're as financially viable as Jeremy was,so remarks such as he made would have gone right over my head.
Sadly,his impressionable remarks got him locked up. Nobody had figured him out.