Getty Images North America 1 / 14
Getty Images North America 1 / 14

In the wake of singer Christina Grimmie's fatal shooting at a concert on June 10, gun safety advocates are coming out in force, pressing for the need for change in gun law policy.

Julianne Moore -- who in October launched an entertainment arm offshoot of the group Everytown for Gun Safety -- is among them.

On June 11, the actress retweeted an impassioned post about Christina from NBC that read, "We are heartbroken. @TheRealGrimmie is a loved member of our family. Our thoughts are with her and her family."

She also urged "Voice" coaches Blake Shelton and Adam Levine, both of whom shared their grief over Christina's senseless death on social media, to join her in the fight to end gun violence.

"@blakeshelton @adamlevine pls consider joining @Everytown @MomsDemand we could use your voices #EndGunViolence," Julianne wrote, tagging Everytown For Gun Safety and another organization, Moms Demand Action for Gun Safety in America.

Later, the "Still Alice" star retweeted a post from Sharon Watts, the founder of Moms Demand: "Don't bother tweeting me 'Too soon to talk gun laws," Sharon tweeted, "for 91 fatally shot daily in US, it's too late. #RIPChristina."

Earlier this year, Julianne wrote an essay in Lena Dunham and Jenni Konner's Lenny letter about how and why she became involved in gun safety advocacy work.

Recalling the experience of having to confirm to her then 10-year-old daughter that 20 children and six adults had been murdered at the hands of a shooter in Newtown, Connecticut, Julianne noted that the gun violence rate is 25 times higher in the U.S. than in other developed countries.

"I don't ever want to have to explain another Newtown to my kids," she wrote, "and neither should you."

Grimmie, 22, was killed by a man she did not know while signing autographs at her merch table at a concert in Orlando, Florida. Police later learned the assailant had traveled to her show intentionally from another city and was carrying multiple weapons. He turned the gun on himself after he killed Christina.

A hugely popular singer on YouTube, Christina finished third on "The Voice" in 2014 with coaching help from Adam Levine.