so you could say that Tintin may have killed Herge with the stress of making the adventures.
If Hergé had died at his drawing board during the 1950s, his health broken by overwork, you'd have a point. As Cigars points out, he had nervous breakdowns during his periods of overwork, and maybe felt then that Tintin was in danger of killing him. (There's that well known drawing he did of himself at the drawing board with Tintin standing over him with a cat-o'-nine-tails whip.) Quite a few famous strip cartoonists have
damaged their mental and/or physical health through overwork and probably died younger than they might have, eg: Winsor McKay, Frank Hampson, Dudley D Watkins. It seems to be an occupational hazard.
But surely Hergé is an example of of a strip-cartoonist who escaped from this hazard. He gave up churning out Tintin adventures at such a gruelling rate, produced just a few books in his later decades, enjoyed a relaxed lifestyle, and lived to quite a good age. He died of medical problems which don't seem to have been related to the overwork and stress of his earlier years. So I don't think it's true to say that Tintin killed him.