Christina Grimmie, a YouTube star and finalist on NBC's The Voice, has died following a shooting after an Orlando concert performance.

Grimmie was signing autographs after a performance at The Plaza Live in Orlando, Fla. when an unidentified gunman shot her. The singer's brother, Mark, then tackled the shooter, who then shot and killed himself. Grimmie was rushed to the hospital in critical condition, where she died hours later. She was 22.

"It is with a heavy heart that we can confirm that Christina has passed and went home to be with the Lord," Grimmie's publicist confirmed in a statement. "She was shot at her show in Orlando and, unfortunately, didn't survive the gunshot wounds. We ask at this time that you respect the privacy of her family and friends in their time of mourning."

Grimmie rose to fame with her YouTube covers of famous songs, which caught the attention of millions. She amassed a big teenage fanbase and tried out for season 6 of The Voice in 2014. She picked Adam Levine as her coach, and had some of the most memorable Voice performances, including her stipped down covers of Drake's "Hold On, We're Going Home" and Lil Wayne's "How to Love". Grimmie made it all the way to third place.

After The Voice, Grimmie put out multiple singles and an EP.

Alumni from The Voice have been tweeting their condolences for this crushing loss, as have various celebrities.