Zach Sobiech, who wrote the viral farewell song "Clouds," lost his battle with bone cancer Monday morning. He was 18.The Children's Cancer Research Fund shared the news on its website, writing: "Zach was at home and at peace with those he loved most. Zach's life ended just as he lived, embraced by the love of his family, friends, grace and music."Sobiech, who was diagnosed with osteosarcoma when he was 14, was told last June that he had only one year to live. On Dec. 5, the Minnesota high school senior posted a farewell song, "Clouds," on YouTube. It has since reached more than three millions views and landed him a songwriting contract with BMI. It even inspired The Office's Rainn Wilson to lead fellow celebs in a lip-sync tribute to Sobiech's song just two weeks ago.Remember other celebs we've lost this year"Cancer may have taken Zach too soon, but he leaves a lasting legacy that most of us will never achieve," The Children's Cancer Research Fund's statement continued. "His message of love and hope delivered through infectious lyrics and memorable tunes have imprinted on the minds and hearts of millions around the world."Sobiech is survived by his parents, Rob and Laura, and siblings Alli, Sam and Grace. The family asks that all memorials be directed to the Zach Sobiech Osteosarcoma Fund."His legacy will also help the children of tomorrow who learn that they have osteosarcoma, the type of cancer that took Zach's life," The statement reads. "Because of Zach, his family's support, and the donations of thousands in his name, kids with osteosarcoma will have better outcomes in the future. This was a source of comfort to Zach in his last days, and will provide comfort to his family going forward."Watch "Clouds" below.