Yes, I was surprised! Usually it's actually someone present at the death, isn't it, or a relative? Millard was Canadian, but I can't see that Gates was a relative.
I tried searching by Address, of course, on both websites, but Devonshire Street itself, let alone no. 45 just didn't come up. As I said, I haven't had this problem before and can't see what the issue is. A nursing home would make sense, but I'd just like to locate the actual citation.