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.
More top news
An ITV News investigation has learned that 99 children were treated on adult mental health wards in the first four months of this year.
Aside from the heat, lightning storms may have kept you awake last night; the Met Office have warned more can be expected tonight.
The temperature is a little cooler, but it's still a very warm day