Do NPC settlers die of heart attacks? (Fallout 4)

Today I saw the following picture: I am engaged in small construction, the workbench is open, suddenly, the number of settlers decreases by one. I dashed through the village, I find the corpse of the supplier, there are no synth parts on the corpse. I think it's an accident. I load the save (literally, I did it a couple of minutes before), it seems, everything is fine, I see how this supplier enters the village, he stands, is going to leave, and ..., he falls dead (he also managed to scream). I load the same save as soon as the supplier comes in, reassign it to agricultural work, and watch. A couple of minutes pass, he digs in the ground, suddenly cries out and dies! Left the game (completely), went in ..., dies, bastard. I repeat, there is no synth detail, no one fired at him, and did not even stand close. Sometimes he manages to go outside the settlement on the route, but still dies (the brahmin disappears immediately). Acute myocardial infarction, ruptured aortic aneurysm? )). Before that, I saw how the suppliers are fighting with superior enemy forces, explode with kamikaze in nuclear explosions and do not die, but here he is .... Pichal.