Over the last couple of years, I've been seeing Kai very approximately once a month or so, he generally keeps away from me, and if Zev sees him sniffing around the back garden, she'll go out and stare at him, until he wanders off.
I had to replace the old cat-flap, so he's not programmed into the replacement, and can no longer get into the house, unless I let him in.
I hadn't seen him for several months, but yesterday saw him sunning himself, lying on one of my neighbours front steps. That was a bit of a relief, because I was worried that something had happened to him, unbeknownst to me. He looks healthy and well fed, so is clearly still acquiring food from someone other than me.