@hawkeye10,
Hawkeye,
It was documented that he "may" have had depression well yes, it's pretty evident from his own admission that he did.
It was also documented that he may have had Parkinson decease.
It's more than likely she does not want people to think he committed suicide through depression.
Anything else would mean that it was a brain disorder, not saying depression isn't who knows.
But, depression would suggest she as a wife, was un-able to jump him out of it and if she stated she's been searching for a year, you can bet your bottom dollar that she has been bashing herself up, wondering what she could have done.
Those in pain, will find another reason.
I think personally you are reading into it too much.