'The Voice' contestant Christina Grimmie shot dead by gunman

Singer Christina Grimmie, who starred in NBC's "The Voice", died Friday after being shot at a concert in Orlando, Florida by an unidentified gunman, who then fatally shot himself, police said.

"With deep regret, we have confirmed Christina Grimmie, @TheRealGrimmie, has died from her injuries," the Orlando Police Department said on its Twitter account.

The 22-year-old Grimmie had performed with the group Before You Exit at Orlando's Plaza Live and stayed after to sign autographs.

A man, who was armed with two guns, walked toward her and shot her, police said.

"Christina's brother immediately tackled the suspect, who shot & killed himself," the police said.

Grimmie was rushed to the Orlando Regional Medical Center.

The motive of the gunman, who was not identified, was unclear.

"We don't know if he was just a crazy fan that followed her on Twitter or on social media. We really don't know," police spokeswoman Wanda Miglio said at a news conference.

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

Grimmie, who competed in the sixth season of "The Voice" in 2014, released her debut EP Find Me in 2011.