Strange, but I can't find anything. Seems that all cases of death from COVID-19 always happened only in presence of doctors in hospitals, nursing homes and other similar facilities.
To disprove that I need some documented case when somebody without any comorbidites died from COVID-19 at home f.e. and there are no any other reasons for death found, only sudden inflammation lung damage and death due to oxygen lack.
Strokes and heart attacks are fishy, they are not rare and they could be connected with COVID-19 or not, and it is nearly impossible to check.
However, death at home due to the lack of oxygen along with inflammation damage of lungs without the signs of drowing is rare thing.
Also, as far as I heard from MSM, people diagnosed with COVID-19 mostly die on ventilator in hospital and not from some strokes and heart attacks.
So, healthy man without any comorbidities who died from lack of oxygen with inflammation damaged lungs is the best possible marker.