At the beginning of this discussion, edcharlesadams came up with a very good list of fatalities
in each Tintin book.
Another that we could consider is in:King Ottokar's Sceptre
Kaviarovitch, the man who collapses in Tintin's flat (page 7). In Alfred Alembick's notebook, he is described as "liquidated" (page 60). Mind you, it's hard to tell if the plotters assumed he was dead when they left him at Tintin's flat or if he was murdered later.Dupont et Dupond, détectives
Another that we could add is a death in the text story "Dupont et Dupond, détectives" ("Thomson and Thompson, Detectives") which was published in the "Le Soir" newspaper in 1943, right after "Red Rackham's Treasure". This was less of a comic strip and more of a text story with illustrations (in a way similar to "Rupert Bear", though without the rhyming summaries).
In this story, the Thompsons investigate the disappearance of their farmer friend and this leads to the discovery of a murder!
The story was written by Paul Kinnet, a writer of detective stories, but illustrated by Herge and I am told that the humour is very typical of Herge as well so I think that it can be classed as a "Tintin" adventure even if he does not appear in it.
I don't know if there is an English translation of this story, but a full account has recently been added to a Tintin Fandom site
.The Blue Lotus
There is a discussion about the 12 Japanese killed in a train crash
. I don't think that those deaths actually occur. On page 18, Mitsuhirato has a conversation with a Japanese official about his mission and they mention "propaganda". On page 22, the same official is informed of the destruction of the railway track (which he knows was done by Mitsuhirato) but that the damage was materialistic and no real consequences.
But the official then launches a major propaganda campaign of false information, claiming that it was an actual attack by Chinese bandits on a train in which several people were killed and this is reported throughout the world and thus justifying Japanese outrage and expansion of their presence in China. But I think that there was no train or victims at all.Jo, Zette and Jocko
Herge included fatal events in his other work:The Eruption of Karamako
The volcano lays waste to an entire island, quite likely wiping out all the local natives since they are not seen after the disaster (page 3).
When the scientist destroys the underwater base, he is quite likely killed in the subsequent flooding, maybe even some of the pirates who were not captured by the US Navy seamen (page 44).Mr Pump's Legacy
John Archibald Pump is killed when his racing car crashes (page 4).Destination New York
Werner has a car crash (page 40). He lives long enough to make a confession of his crimes but a nurse states that he will not last for long.
A stunt pilot attempts to crash into Jo and Zette's plane but misses and does not appear to be able to bail out by parachute before hitting the ground (page 46).The Valley of the Cobras
Towards the end, a man known as the "guide" is fatally bitten by a cobra (page 50).
Ramahyouni the prime minister and Rabindah the fakir are blown up by dynamite (page 51).