Oh no, I'm so very, very sorry for your loss, Koneko Otaku.
I cannot imagine the loss you're feeling, but I send you warm hugs to you and petpets to Den mother Tux. I think she will eventually know he's gone, but it may take some time. Hope you find some peace and comfort knowing Stripes went fairly quickly, in little pain, I suspect. He was a very pretty tabby cat.