The teen sister of former One Direction member Louis Tomlinson has died at the age of 18, according to authorities.

People reports that Félicité, a fashion designer, passed away on Wednesday in London from a suspected heart attack. A friend who was with the teen at her apartment contacted 999. Emergency responders tried to resuscitate Félicité but their efforts were futile. She was pronounced dead shortly after.

“Police were called by the London Ambulance Service at 12.52pm to a residential address in SW5,” a spokesperson for the Met Police said, according The Sun.

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A London Ambulance Service spokesperson reportedly said they tried everything possible to save the teen.

“We sent two ambulance crews, a single responder in a car and an advanced paramedic to the scene. Sadly, despite efforts of our medics, a person died.”

View this post on Instagram

Don’t know why I look so shocked 🖤

A post shared by Félicité Tomlinson (@felicitegrace) on Mar 10, 2019 at 5:11am PDT

Initial reports indicated police found no traces of drugs inside the apartment, but an autopsy and toxicology testing is reportedly being scheduled.

Louis Tomlinson, who lost his mother three years ago to cancer, hasn’t yet made a public comment regarding his sister’s untimely death. However, a friend close to the singer reportedly said he was “devastated and ­distraught,” according to The Sun.

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[Feature Photo: Louis Tomlinson, Félicité/Instagram]