I also missed the thread. So sorry to hear this!
He and I never co-authored walkthroughs, but we were always there for each other when there was something either of us needed help solving.
It's been a few years since I have written any walkthroughs, but Mr. Bill and I were both into it "back in the day" starting something like thirty years ago. All we had was e-mail, so it took a while. I miss that.
Condolences, hugs and best wishes to his family.