felicite-tomlinson-4

Louis Tomlinsonfamily is mourning the loss of their sibling Félicité, whodied last Wednesday in her London apartment of a suspected cardiac arrestat the age of 18.

“Words don’t even begin to describe how shocked and broken hearted we all are,” Phoebe, 14, began her message. “You were my best friend, sister, motivator and person that could make me laugh until I cried. I’m lost without you and the thought of never seeing you again scares me like you wouldn’t believe.”

Later in their message, Phoebe referenced her late mother Johannah Deakin, who died after a battle with leukemia on Dec. 7, 2016 at the age of 43.

“Mummy needed you and you desperately needed her. I’m so glad your [sic] together now and she has you to rub her feet in heaven like you used to. I pray that you’re in a better place now. We love you like you wouldn’t believe.”

RELATED VIDEO: Harry Styles Mourns Death of Stepfather Robin Twist

“No words will come close to explaining how broken I am, once again. My precious sister. My heart is bleeding. I keep imagining and praying they have the wrong person. Not my sister, my best friend,” she began.

“Mama needed you. i hope you are happier up there with her,” she concluded. “make sure you don’t forget about us. keep us in your conversations. i have two angels now, watching over me. i can’t wait to make you both so proud of me.”

Sister Lottie, 20,shared a few photos with her late sisteron Tuesday.

On Wednesday, Félicité passed out after a suspected cardiac arrest at her studio apartment in Earls Court, West London,The Sunreports.

A friend, who was with Félicité at the time of the incident, immediately dialed 911.

When emergency responders arrived to the home they attempted to resuscitate Félicité; however, it was too late. She was pronounced dead at the scene,The SunandThe Daily Starreport.

Félicite Tomlinson.

felicite-tomlinson-3

Before her sudden death, Félicité, who was also known as Fizzy, worked as a model and influencer with over one million followers on Instagram.

Her last post was on March 10. “Don’t know why I look so shocked,” Félicité captioned the shot, which shows her posing in a mirror wearing a black one-shoulder top and blue jeans.

Louis, 27, has not yet addressed his sister’s death publicly, though celebrity friendsJames CordenandCharlie Puthreached out via Twitter.

A representative for the singer did not immediately respond to PEOPLE’s request for comment.

“They are totally devastated as you can imagine. She had so many friends and was such a positive happy person. It’s a massive loss to the world.”

source: people.com