One Direction Singer Louis Tomlinson's Teen Sister Dies

LONDON, ENGLAND - OCTOBER 31: Louis Tomlinson attends the Pride Of Britain awards at the Grosvenor House Hotel on October 31, 2016 in London, England. (Photo by Chris Jackson/Getty Images)

One Direction singer Louis Tomlinson's 18-year-old sister has reportedly died of a suspected heart attack.

Felicite Tomlinson, a fashion designer, was reportedly at her London home Wednesday afternoon when she collapsed after going into cardiac arrest, BBC reports.

Louis canceled a scheduled appearance Wednesday night after he learned the news, BBC reports.

The devastating loss comes just two years after Louis and Felicite's mother died of leukemia in 2016. They have five other siblings, of which Louis is the eldest.

Just last week, Louis released a song about the pain of losing his mother. He opened up about his struggle with local UK media, saying: "I used to lean on my mum for a lot of things - anytime I needed advice on something she would be the first call I made."

He added that he hoped the song would help his sisters in their grief, noting "as their big brother if I can sing those words it'll hopefully help them too."

Family ❤️

250.2k Likes, 2,836 Comments - Félicité Tomlinson (@felicitegrace) on Instagram: "Family ❤️"