Christina Grimmie, who represented Adam Levine's team and placed third on The Voice's sixth season, was tragically shot and killed at the young age of 22 after an Orlando concert.

Grimmie died in the hospital from her wounds several hours after being shot on Friday by an unidentified gunman, CNN reported.

According to witnesses, the assailant open fired while Grimmie was signing autographs and posing for pictures with fans following her opening-act performance for the band Before You Exit at The Plaza Live in Orlando, FL.

Grimmie's brother Mark reportedly wrestled the killer to the ground before the shooter took his own life. 

"Her brother is a hero for saving and stopping him from not hurting anyone else," Orlando police spokeswoman Wanda Miglio said in a statement obtained by CNN.

Hours before the incident, Grimmie took to Twitter asking fans to attend the concert, which started at 7:30PM.

Orlando Police Chief John Mina said the gunman had "traveled to Orlando apparently to commit this crime." Mina also revealed the killer was a 21-year-old white male, who arrived to the scene with two handguns and a large hunting knife. 

Levine expressed his sympathy on Instagram Friday night over the loss of Grimmie.

"I'm sad, shocked and confused," Levine captioned a photo of himself with the singer as they made cute, goofy faces. "We love you so much Grimmie. This just isn't fair."

Grimmie's Twitter account was eerily hacked into Saturday morning, with someone simply posting, "The end."

Shelton, who has served as a mainstay coach on The Voice alongside Levine since the show debuted in 2011, also tweeted, "I'm stunned and disgusted and heartbroken that we lost that sweet little girl... Keeping @TheRealGrimmie family in my heart and mind."

The Voice's official Twitter page posted the following message: "There are no words. We lost a beautiful soul with an amazing voice. Our hearts go out to the friends, fans and family of @TheRealGrimmie."