Christina Grimmie performs at a 2015 concert.Steve Marcus / Reuters

A gunman shot and killed singer Christina Grimmie, a former contestant on NBC’s The Voice, outside an Orlando concert Friday night before turning the gun on himself.

Grimmie opened for the band Before You Exit and was signing autographs after the concert when she was shot. Hours before her death, she posted a video on Twitter urging fans to come to the performance.

The Orlando Sentinel has more:

Grimmie, 22, opened the show, then Before You Exit took the stage. The show ended about 10 p.m., police spokeswoman Wanda Miglio said.

After the show, Grimmie and the band signed autographs near a merchandise table inside.

That's when a man armed with two guns walked up and opened fire on her, Miglio said. She was hit at least once.

Her brother tackled the suspect to the ground. The suspect then fatally shot himself.

The gunman’s identity and possible motive are unknown.

Grimmie began her musical career performing covers of popular songs on YouTube. In 2014, she competed on The Voice, a musical reality show on NBC, where she attained third place. Maroon 5 frontman Adam Levine, who coached her during her time on the show, said he was “sad, shocked, and confused” by her murder.

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