In the inchoate years of the space age, the “old age” cause of death was abrogated in favor of more precise terms: “heart failure”, “secondary infection from weakened immune response”, und so weiter.
In subsequent years, a new cause was added: “stupidity”.
Space is hazardous to the point of absurdity. Leaking atmo? Death. Forget your transfer window? Death. Out of EVA fuel? Death. The universe is cold and dispassionate, and with better tools and equipment, the human error of incompetence increasingly–and vastly–was outstripping pure technological failure.
When the report came in of another deceased spacer, the cause of death ended up being “stupidity” more than 3/4 of the time. Did it really matter that he suffocated on his own vomited organs? No. It mattered that, due to stupidity, he ventured outside the shadow shield of his atom-ship. Did it really matter that her flesh slowly charred away, trapped by her own skeleton in restraints of melting steel? No. It mattered that she crammed her ship full of personal effects and didn’t have enough fuel to break atmo.
Death in space environments is final and harsh. And when a corpse can be recovered, exact specificity in cause is wasted inquiry, and never comfort to the bereaved.