Going deep into the weeds of biochemistry, a result of Covid 19 infection is a production of super oxidized chemicals which in a sense kills like a disinfectant from the inside out. {irony alert}
70% of fatalities show evidence of the oxidation causing blood clots which can kill many people overnight including the young.
Cause of death is called respiratory but it is bloodclots throughout the body. Covid is acting like a hemmoragic disease like Dengue, Ebola and others on a microscopic scale.