die of
Synonym discussion
Sense: phrasal verb/1
'die of' is the neutral, everyday way to name the cause of death — used in medical reports, news, and casual conversation alike. 'pass away from' is gentler, often used in formal condolences or obituaries to soften the finality of death. 'succumb to' carries a literary or journalistic tone, implying the person fought against the cause (e.g. 'succumbed to his injuries'). 'be killed by' is reserved for external, violent, or accidental causes (car crash, gunshot, poison) — never for natural illness or old age. For example: 'She died of pneumonia at 94' (neutral); 'He passed away from complications after surgery' (respectful, formal); 'The soldier succumbed to his battlefield wounds' (dramatic, literary).