Do you know the rat-catcher?

Do you know the rat-catcher?

Of course I do. He’s alright, is Xebbert — I just wonder how he could endure the sewers all the time. They say he entered the sewers and never came back.
Do you think he might be dead?
He never was one of my customers. And he is not berried on the Boron field either. So I’d prefer to think he’s alive.