If you get hit by a car and go into fatal cardiac arrest on the ground, you can’t say that you weren’t killed by the accident.
A little more on point: cancer patients are immunosuppressed and more likely to contract infections. You add damage to the heart, lungs or kidneys, and a person who could have lived with cancer for years can be killed by Covid.
A search on PubMed would show other examples.
April 12, 2017
July 06, 2017
July 23, 2017