Louis Tomlinson had wished his loyal fans a good day just hours before news broke his sister Félicité had died of a suspected heart attack at the age of 18.
The singer, 27, was preparing to perform for Comic Relief, when on Wednesday he took to Twitter to share one last message.
‘Hope everyone has a good day!’ he wrote to his 33.2 million followers. ‘Vocals finished now onto some interviews!’
It’s now been reported he has cancelled his performance.
It truly heartbreaking events to follow, it was announced this evening his teenage sister collapsed and died on Wednesday in her studio in Earls Court, West London.
The London Ambulance Service said to Metro.co.uk in a statement: ‘We were called at 12.51pm.
‘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.’
Louis, 27, was working in London and informed of his sister’s death the same day. He also has sisters Charlotte (Lottie), Daisy, Georgia and Phoebe and the family shared a close bond.
Sources close to the Tomlinson family told TMZ Félicité had ‘absolutely no warning signs’ and they knew of ‘no prior history of heart trouble’.
The website alleged she suffered from sciatica, an extreme form of back pain that originates from the nerves.
A family friend told The Sun: ‘Félicité was an absolutely adored young woman who was loved by Louis and her whole family.’
One Direction singer Louis was left devastated after his beloved mum, Johannah Deakin, died in December 2016 after a battle with leukemia.
He recently released his song Two Of Us, which was about the passing of Johannah – which he was set to perform tomorrow.
It sports the lyrics: ‘You’ll never know how much I miss you. The day that they took you, I wish it was me instead.’
Speaking about the song to her followers on Instagram, Félicité told fans on hearing the song: ‘I cried my eyes out in the back of my Uber, but I loved the song filled me with hope.’
Opening up on his grief to BBC Radio 1’s Newsbeat, Louis said of the song: ‘I’m not at the stage in my grief where I’m going to open the first verse and burst into tears.
‘It was something I needed to get off my chest. 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.’
Celebrities including Brian McFadden have begun to pay tribute to the performer’s sister on social media.
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MORE: Louis Tomlinson shares grief over mother Johannah’s death: ‘It’s sad what happened to me’