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Singer Christina Grimmie, a former finalist on NBC's "The Voice," died early Saturday, hours after a gunman's attack at a Florida concert venue, according to Orlando police.

Grimmie, 22, performed Friday evening at Orlando's Plaza Live venue, followed by the band Before You Exit. She and band members were signing autographs about 10:45 p.m. when the gunman attacked, according to Orlando police.

The suspect "walked toward Christina and shot her," police said in a Twitter message. "Christina's brother immediately tackled the suspect" - who then shot and killed himself, authorities said.

Police Sgt. Wanda Miglio told the Orlando Sentinel that the assailant was carrying two guns when he opened fire on Grimmie. "She was hit at least once," Miglio said.

The actions of Grimmie's brother saved others from injury, Miglio said.

"This is a very tragic event," Miglio said. "This should have been something fun and exciting, and for this to happen is just a tragedy."

Josh Call, who was working outside the concert venue, told the Orlando Sentinel he heard a series of rapid shots.

"It was quick like pow, pow, pow, pow," he told the newspaper.

Police did not identify the gunman or a motive for the shooting. A news conference was scheduled for Saturday morning.

A publicist for Grimmie said in an email to the Associated Press early Saturday that "we can confirm that Christina has passed and went home to be with the Lord."

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.

Earlier Friday, Grimmie posted a message on Twitter inviting fans to her concert.

"Please come out," she said.

Grimmie, a New Jersey native, finished in third place during Season 6 of "The Voice."

Her mentor was Maroon 5's Adam Levine, who posted a photo of himself with Grimmie on Instagram after the shooting - but before her death.

I'm sad, shocked and confused. We love you so much Grimmie. We are all praying hard that you can pull through this…this just isn't fair. A photo posted by Adam Levine (@adamlevine) on Jun 10, 2016 at 11:35pm PDT

"Can't believe this," another "Voice" coach, Blake Shelton, wrote on Twitter.

Country singer Jake Worthington, who was a "Voice" finalist with Grimmie, expressed outrage after the shooting, saying he wanted to hurt the gunman.

#PrayForChristina I cannot possibly Fathom why some one would do this to some one so kind and full hearted… I'm praying for you girl…..

"Christina was such a loving, caring, beautiful person," the band Before You Exit wrote on Twitter, adding: "We are so saddened by her passing and completely heartbroken."

Here Grimmie performs "With Love" on "The Voice" in 2014.