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The Cat died first. Went to sleep one day and just never woke up. It was to be expected. He was flesh. Flesh died. Kryten had always known it would happen one day. He shouldn't feel grief but he did. If he had a heart it would have broken.
Rimmer was already dead, but his hologram becomes no more two years after the Cat's death. A virus of some sort. Despite not getting on with him, he missed him.
Red Dwarf had never felt more empty. But Kryten hadn't let himself drown in loss. Mr Lister had needed him more than ever. For twenty years, he kept him sane. Happy, fed. It was a good life. But death came for Lister too.
Now it was just him. All alone again.