At the opening of the inquest into the death of Peaches Geldof, Detective Chief Inspector Paul Fotheringham, of the Kent and Essex Serious Crime Directorate, said a post-mortem examination was inconclusive, prompting further tests.
But he told the hearing: "Recent use of heroin and the levels identified were likely to have played a role in her death."
Her mother, TV presenter and writer Paula Yates, died from an accidental heroin overdose at her London home 14 years ago.
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A woman who was "dragged away" by a crocodile as her friend tried in vain to rescue her is reportedly still missing in Australia.
Police say at least one gunman armed with a high-powered rifle, began "shooting randomly" resulting in the death of a man in his 50s.
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