It will be more difficult not knowing info about the man...note that there are three numerals on bottom of p1. Do they, or a relative-addition combo, mean anything? It seems to have an unencrypted possessive apostrophe-S combo.
It’s the only apostrophe I can make out. There may be another; but am not sure. Also uses wld and al a lot and several dashes.
What struck me as odd is when he uses parentheses he does so with code beginning with letters; never with numbers except one place and that is the 194.
Article is short on identifiers, but for guy with 9th grade education to baffle the FBI for 10 yrs, indicates that this will be solved by dumb luck.
If I were to guess they will eventually find that the code has nothing to do with his death. More likely he was in wrong place at wrong time.
On the other hand if this code means anything will be interesting once key is discovered.