So very sorry to hear this sad news, and I send my condolences to his family.
As so many people have said before, Peter was a true genealogical gentleman, a respected helper, member and moderator on this site.
He helped me a great deal with my Cheshire ancestors, and was always patient and understanding of my ignorance when I was a newbie -- and afterwards too, if the truth be told.
He will have broken down all his brick walls
Rest peacefully....