Joan Rivers died from low blood oxygen during a routine medical procedure to check out voice changes and reflux, the medical examiner’s office has ruled.

Joan Rivers, the acid-tongued comedian who crashed the male-dominated realm of late-night talk shows and turned Hollywood red carpets into danger zones for badly dressed celebrities, died yesterday. She was 81.

Hollywood A-listers Catherine Zeta-Jones and Nicole Kidman were shocked when US cable network E! approached them to be presenters.