HDL,

Tonight I had a strange feeling that I should Google your father;
which is how I learned of his passing.  You may have already see my
text; however, I am writing here additionally.

Now, David, you can finally free (yourself) from the unyielding
shackles that torment your mind.

My heartfelt concern and prayers go out to you.  It must be extremely
difficult to digest that your Dad's mind-encompassing presence is
simply - at rest.

Your friend