The teenage sister of One Direction star Louis Tomlinson died accidentally after taking a lethal cocktail of drugs, a coroner has concluded.
Felicite Tomlinson, 18, was found unresponsive by a friend at her west London flat at lunchtime on March 13.
The pair had taken cocaine the night before and although emergency services attempted to resuscitate Miss Tomlinson, she was pronounced dead at the scene.
Louis Tomlinson's sister Felicite dies
Louis Tomlinson's sister Felicite dies
Her reported passing comes just a few years after the death of their mother.
Louis Tomlinson's sister Félicité, 18, found dead at London home after 'suspected heart attack'
One Direction Star Louis Tomlinson's Sister Félicité Dead at 18
The 18-year-old, known as Fizzy, was an aspiring Fashion designer. Source: Instagram
One Direction star Louis Tomlinson's sister Félicité, 18, 'found dead at home'
Félicité Tomlinson, younger sister of former One Direction member Louis Tomlinson, died Wednesday at age 18.
2017 Teen Choice Awards – Show – Los Angeles, California, U.S., 13/08/2017 - Louis Tomlinson and Bebe Rexha perform "Back to You." REUTERS/Mike Blake
Britain Football Soccer - England XI v Rest of the World XI - Soccer Aid 2016 - Old Trafford - 5/6/16
England XI's Louis Tomlinson and Rest of the World XI's Niall Horan
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One Direction members British singers and songwriters Louis Tomlinson (R) and Liam Payne receive their British Video award at the BRIT Awards at the O2 arena in London, Britain, February 24, 2016. REUTERS/Stefan Wermuth EDITORIAL USE ONLY
British singers and songwriters Louis Tomlinson (L) and Liam Payne arrive at the BRIT Awards at the O2 arena in London, February 24, 2016. REUTERS/Paul Hackett
Members of boy band One Direction, Niall Horan (L-R), Liam Payne, Louis Tomlinson, Zayn Malik and Harry Styles, attend the Royal Variety Performance in support of the Entertainment Artistes' Benevolent Fund, at the Palladium Theatre in London November 13, 2014. REUTERS/Yui Mok/Pool (BRITAIN - Tags: ENTERTAINMENT SOCIETY)
British boy band One Direction arrives at the Cannes festival palace to attend the NRJ Music Awards in Cannes December 14, 2013. Pictured are (L-R): Louis Tomlinson, Niall Horan, Liam Payne, Zayn Malik, Harry Styles. REUTERS/Eric Gaillard (FRANCE - Tags: ENTERTAINMENT)
(From L to R) Louis Tomlinson, Niall Horan, Liam Payne and Harry Styles of British boy band One Direction arrive for the premiere of their documentary film "This is Us" in New York, August 26, 2013. REUTERS/Lucas Jackson (UNITED STATES - Tags: ENTERTAINMENT)
Members of the music group One Direction (L-R) Louis Tomlinson, Niall Horan, Zayne Malik, Liam Payne, Harry Styles, and Director Morgan Spurlock, pose for photographers during a photocall for their film 'One Direction; This is Us' in London August 19 2013. REUTERS/Suzanne Plunkett (BRITAIN - Tags: ENTERTAINMENT SOCIETY)
Performer Louis Tomlinson from One Direction sits with his friend in the front row at the Unique for Topshop Autumn/Winter 2013 collection during London Fashion Week, February 17, 2013. REUTERS/Olivia Harris (BRITAIN - Tags: FASHION ENTERTAINMENT)
Members of British-Irish boy band One Direction (L-R) Zayn Malik, Niall Horan, Harry Styles, Louis Tomlinson and Liam Payne arrive for the premiere of "Men In Black 3" in New York May 23, 2012. REUTERS/Andrew Kelly (UNITED STATES - Tags: ENTERTAINMENT)
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A toxicology report revealed there were traces of cocaine and the medications Xanax and OxyContin in her system.
Coroner Shirley Radcliffe said the combination of the drugs "proved fatal".
"It was the perfect storm," she said.
Miss Tomlinson, known to friends as Fizzy, was an aspiring fashion designer and had a history of "recreational drug use over the years [but] on a consistent basis since her mother's death" in 2016, Inner West London Coroner's Court heard.
She had purchased cocaine with with her friend, Zainab Mohammed, the evening before her death.
The inquest heard that Miss Tomlinson had taken cocaine, MDMA, acid and cannabis in the past and knew a number of people who could access these drugs.
Recounting Miss Mohammed's version of events, Dr Radcliffe said: "A male friend came over and you did lines [of cocaine], one or two, but you felt unwell.
"You saw [Felicite] do more lines but you didn't know how many she did."
Miss Tomlinson was still breathing when checked at 5am but when she woke around noon, Miss Mohammed, who attended Wednesday's hearing, "couldn't hear breathing" from the bed next to her.
Miss Mohammed only spoke to confirm the coroner's statements.
Felicite's pop-star brother had attended a number of appointments with the 18-year-old in the months before her death, the hearing was told.
Dr Paul Eulinger, her GP, said in a statement that Felicite "refused to give up drugs in the knowledge they could kill her".
After some persuasion, Miss Tomlinson completed a successful stint in an Egyptian rehab facility in Autumn 2018 and tested clean on her return to the UK on November 26, but she then relapsed in 2019.
Concluding the teenager's death was a result of misadventure and drugs toxicity, Dr Radcliffe said: "[Felicite] was a bright, much-loved daughter and sister.
"Her family clearly wanted her to engage with drug services.
"Her use of drugs was a considerable danger to her.
"She was an individual who took drugs deliberately and has succumbed to their said effects accidentally.
"There is no indication this was a deliberate attempt to end her life."
Paying tribute at the time of her death, Felicite's sister, Phoebe said: " You were my best friend, sister, motivator and person that could make me laugh until I cried."