Zach Sobiech passed away on Monday, May 20 at the age of 18 -- but his inspirational message will live on through song. The Minnesota native learned last June that he only had months to live after being diagnosed with osteosarcoma at the age of 14, and decided to record the song "Clouds" as a farewell message to his family and friends.
The YouTube video, released in December, quickly went viral and has now hit No. 1 on iTunes. With the help of director Justin Baldoni, Sobiech also filmed a 22-minute documentary, My Last Days: Meet Zach Sobiech.
"I want everyone to know, you don't have to find out you're dying to start living," Sobiech says in the video.
"My closure is being able to get my feelings into these songs so they can have something to remember me by or lean on when I'm gone," he explains of his album, Fix Me Up. "I want to be remembered as a kid who went down fighting, and didn't really lose."
Earlier this month, celebrities filmed a tribute video to Sobiech to help raise awareness to find a cure for childhood cancer. Jason Mraz, Ashley Tisdale, Rainn Wilson, Ed Helms, Rachel Bilson, Jenna Fischer and other stars sang along to Sobiech's "Clouds" track in the touching video.
When Sobiech passed away on Monday, celebrities took to Twitter to share their condolences and support Sobiech's legacy.
Jason Derulo: "You did it brother! No. 1 on iTunes! RIP Zach Sobiech. I know you're smiling down from the clouds. No more pain."
Ed Sheeran: "Zach Sobiech: 'You don't have to find out you're dying to start living' XX"
Rainn Wilson: "RIP . . . 'You don't have to find out you're dying to start living' -- Zach Sobiech."
Scooter Braun: "Although I never met him he inspired me in how he lived. An amazing soul. RIP Zach Sobiech. Thank you for your message."
Justin Baldoni: "Clouds is No. 1 on ITUNES. Every download goes to Zach Sobiech fund. I am overwhelmed . . . I don't even know what to say."
This article originally appeared on Usmagazine.com: Zach Sobiech Dies: Clouds Singer, 18, Leaves Inspirational Video Behind