“everything points to a death by natural causes.”
At 33 years of age?........hmm
naturally resulting from the effects of that crash
Did you read even the excerpt?
“De Villota was seriously injured last year in a crash during testing for the Marussia F1 team in England, losing her right eye and sustaining other serious head injuries that kept her hospitalized for a month.”
I expect “natural causes” in this context could mean delayed effects from the above. No one stabbed her or similar.