Earlier this fall, Toronto teen Olivia Wise posted a video on YouTube of her singing Katy Perry's morale-boosting anthem "Roar." But this was not just one of the hundreds of thousands of such pop song covers that populate YouTube. Wise, still only 16, was battling brain cancer. She has now lost that battle.

Recorded in September and posted on Oct. 14, the video of Wise in a recording studio performing quickly went viral and has now passed 1.1 million views. "She couldn't walk or stand, she didn't have her full breath or the energy she used to, and she was managing her new pains and new limitations," the YouTube description said. "While her physical condition was rapidly fading, her spirit remained untouched."

As her rendition went around the world, it even attracting the attention of Perry herself, who recorded a response video to the young Canadian.

"Hey Olivia, it's Katy Perry here," she said. "I just wanted to reach back out to you and tell you that I saw your video and I was very moved and you sounded great. For being in the studio and making your wish to record that song, I thought that was really cool. I love you and a lot of people love you and that's why your video got to me and everybody that saw it. So I just wanted to send you some love and some light and tell you that I'm thinking about you. Thank you so much, keep roaring."

But it was not to be. On Monday afternoon, Wise died. Family member Jeff Kassel emailed the Toronto Sun to tell them say she had passed away, and that "she died peacefully in her home surrounded by the love of her family."

Upon hearing the news, Perry tweeted her condolences.

Katy Perry
Olivia Wise, I can hear you singing with the angels now. Your spirit & strength has inspired me & so many others... May you rest in peace.

Olivia's version of "Roar" is also for sale on iTunes to raise money for the Liv Wise Fund, which is supporting children living with brain tumors by funding brain tumor research through the Paediatric Oncology Group of Ontario and Palliative Advanced Care Team at Sick Kids Hospital.

As of publication, the fund had raised over $108,000 of its $150,000 goal.

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  • A Big Bang

    Suffering from neuro-blastoma, 7-year-old <a href="http://www.huffingtonpost.com/2012/01/10/maxwell-hinton-make-a-wish-blows-up-building_n_1196589.html" target="_hplink">Maxwell Hinton only wanted one thing</a> from the Make-A-Wish Foundation: To blow up a building. "I watch 'MythBusters' and they inspired me to blow a building up," he explained. <em>To watch Maxwell's wish come true, <a href="http://www.huffingtonpost.com/2012/01/10/maxwell-hinton-make-a-wish-blows-up-building_n_1196589.html" target="_hplink">click here</a>.</em>

  • Princess Natalie

    The governor of Colorado named May 14 "Princess Natalie Day" with the crowning of <a href="http://www.huffingtonpost.com/2011/05/16/make-a-wish-foundation-gi_n_862609.html" target="_hplink">Princess Natalie Wertz</a>, who was born with hypoplastic left heart syndrome. Her wish to become a princess came true, and her dad hopes that it will be the first of many realized dreams. "I think this does give her confidence. I think this gives her hope and motivation," he said. "I think it will give her, if nothing else, something to remember for a long long time." <em>Read Princess Natalie's whole story, <a href="http://www.huffingtonpost.com/2011/05/16/make-a-wish-foundation-gi_n_862609.html" target="_hplink">here</a>.</em>

  • Most Wishes Granted

    In January <a href="http://www.huffingtonpost.com/2012/01/25/john-cena-wwe-superstar-g_n_1229572.html" target="_hplink">WWE star John Cena was honored </a>by the Make-A-Wish Foundation for granting the most wishes in the organization's history. "There's nothing greater than seeing a Make-A-Wish child and the Make-A-Wish family get so excited, get so happy and pretty much be welcomed into the escape that is the WWE," <a href="http://www.azfamily.com/video/featured-videos/WWE-superstar-John-Cena-receives-Make-a-Wish-honor-137903753.html" target="_hplink">Cena told AZFamily.com</a>. "That's pretty much what it's all about for me." <em>Read the whole story, <a href="http://www.huffingtonpost.com/2012/01/25/john-cena-wwe-superstar-g_n_1229572.html" target="_hplink">here</a>.</em>

  • Back As A Survivor

    For <a href="http://www.huffingtonpost.com/2011/03/06/la-dodgers-chris-ramirez_n_831959.html" target="_hplink">Chris Ramirez</a>, the wishes didn't stop just because his cancer did. A year after beating a rare brain tumor, the 18-year-old was invited back to watch the L.A. Dodgers baseball team. He had tried out for the team thanks to Make-A-Wish, and was welcomed back graciously as a cancer survivor. "I feel lucky and the Dodgers gave me something to look forward to," Ramirez said. "They said I can always come back." <em>Read the whole story, <a href="http://www.huffingtonpost.com/2011/03/06/la-dodgers-chris-ramirez_n_831959.html" target="_hplink">here</a>.</em>

  • Grammy's With Rihanna

    In 2012 Rachel Murray, a Cleveland teenager undergoing chemotherapy <a href="http://www.huffingtonpost.com/2010/04/30/dream-comes-true-for-rach_n_558778.html" target="_hplink">got the surprise of a lifetime</a> when she and her parents sat next to Rihanna at the Grammy's -- thanks to the Make-A-Wish Foundation. "I couldn't believe it when Rihanna walked up to me and said hello," <a href="http://www.wkyc.com/news/local/story.aspx?storyid=135175" target="_hplink">Murray told WKYC.com</a>. "I tried to remain calm but I know I was gushing as I asked for her autograph." <em>Read the whole story, <a href="http://www.huffingtonpost.com/2010/04/30/dream-comes-true-for-rach_n_558778.html" target="_hplink">here</a>.</em>