Christina Grimmie, a former contestant on the singing competition The Voice, was shot and killed by a man while signing autographs after an Orlando, Florida show Friday night.
According to CNN, the man was armed with two guns, and fatally shot himself after being tackled by Grimmie's brother.
Hours before the show, 22-year-old Grimmie posted an excited video on Twitter, telling fans about the performance at the Plaza Live theater. Grimmie performed at the show with the band Before You Exit, according to authorities, and had stopped along with the group to meet with fans after the show.
Grimmie, who started off on YouTube and amassed a huge following, made it to the Top 3 on season 6 of The Voice.
After news of Grimmie's death broke, fans and fellow singers like Demi Lovato and Tori Kelly took to Twitter to mourn the rising star.
It is not immediately known how the gunman got past security with the weapons, CNN reported.
"We don't know if he was just a crazy fan that followed her on Twitter or on social media," Orlando Police spokeswoman Wanda Ford said, according to the network. "We really don't know ... it's undetermined at this point."
Grimmie released her final EP, Side A, in February.