If he’s dead, I guess it will remain ‘unsolved’.
I don’t know how you obtain conclusive DNA evidence from a victim who has been living - and presumably sleeping - with the suspect for years.
That will be a real disappointment to many here; unless there’s something interesting in the ‘notebook’.
and he used a sharpie vsa rollerball gell that bleads when you sweat on it.
I am presuming these items were under water for a few weeks or would have been seen before the runoff this week