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Fifi Geldof lashed out via Instagram after her sister Peaches’ autopsy results were released on Wednesday, according to Us Weekly.
Model and TV personality Peaches died from a heroin overdose after relapsing from a battle to give up the drug, a British coroner revealed.
"Don't keep calm and f--- this," Fifi, 31, reportedly wrote on Instagram the day the inquest results were posted. "F--- that. F--- you. F--- off." She added, "Sums it up nicely about how I’m feeling about the viciousness today. Maybe now she’ll be allowed to RIP."
Us Weekly reports that Fifi was upset by how media outlets reported on her younger sister’s cause of death.
On Wednesday, the coroner said 25-year-old Geldof took a fatal dose of high-purity heroin shortly before she was found dead at her home south of London on April 7.
An inquest heard that Geldof — daughter of Live Aid organizer Bob Geldof — was a heroin addict and had been taking the drug substitute methadone for more than two years in a bid to stay free of the opiate.
Her husband, Thomas Cohen, found her body when he returned from a weekend away with the couple's 2-year-old son, Astala. Their younger son, 1-year-old Phaedra, was in the house with his mother.
A pathologist told the inquest that Geldof's blood contained a high level of heroin, along with traces of codeine, methadone and morphine. There were puncture marks on her arms and legs.
The coroner's conclusion is a sad echo of the life of Geldof's mother, Paula Yates, who died of a heroin overdose when Peaches was 11.
The Associated Press contributed to this report.