Christina Grimmie's Brother Premieres Her New Song 'Invisible': 'We Owe It to Her'

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Christina Grimmie is living on through her music.

The late singer's brother, Marcus Grimmie, premiered her new song, "Invisible," on Thursday, during his appearance on Elvis Duran and The Morning Show. Christina was fatally shot last June while signing autographs for fans after her concert in Orlando, Florida.

"It's completely and utterly amazing because obviously we were devastated as a family," Marcus says about the decision to release Christina's music after her death. "For the first three months, we didn't even do anything, and then around August I would say, we were like, 'Hey, you know, we have so much music that she's been working on!' And close fans, friends and family have asked us about it constantly, and we owe it to her."

WATCH: Christina Grimmie's Family Sues Orlando Concert Venue Where Singer Was Fatally Shot

"Since about 2015, she's been just grinding it out, writing songs, and has about 50-60 songs that are finished vocally, and she'd just been putting in hard work," he adds. "It's unbelievable, no one that I have ever met has worked as hard as she has, and that's for sure. We’re very excited to be doing this the way she wanted it done."

The proceeds of the song will go to a memorial fund the family is setting up in Christina's name.

"The really, really cool thing is as a family we're just building Christina’s legacy, because she already left quite a huge mark in this world, and was continuing to do so," Marcus says. "Us as a family, we're still determining the process of what to have the foundation be exactly about, as a lot of people know she was super passionate about breast cancer awareness, animal safety, anti-bullying -- there's so many things. So, we're just figuring out what's the best way to allocate the funds."

Most importantly, the Grimmie family is releasing the new music for the late singer's fans.

"There are tens of thousands of hardcore Team Grimmie fans that every day, they're always praying for you, and saying, 'When's the music coming out! I want to hear it!'" he shares. "They carried her for the last six years of her career and they’re going to continue to carry her legacy."

Watch Christina Grimmie First Posthumous Music Video, 'Snow White'

Last July, Demi Lovato and Nick Jonas paid tribute to the late Voice contestant and YouTube star during their show in Orlando. Watch below: