Stephanie Moseley & Earl Hayes Murder-Suicide: Rihanna, Ashley Tisdale, Chris Brown and More React

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As news spreads of the tragic death of Hit the Floor star Stephanie Moseley at the hands of her husband, rapper Earl Hayes, in what police are calling a murder-suicide on Monday, the couple's many celebrity friends are taking to social media to share their grief.

Moseley, a dancer and choreographer, has worked as a backup dancer to such superstars as Beyonce, Britney Spears and Chris Brown. She was also featured in Ashley Tisdale's 2010 CW show Hellcats, and appeared in The Twilight Saga: Breaking Dawn - Part 1.

The 34-year-old Hayes, who was a member of boxer Floyd Mayweather's Money Team, shot and killed 30-year-old Moseley before turning the gun on himself, the LAPD's initial investigation has determined.

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Rapper 50 Cent reached out to Mayweather -- who reportedly witnessed the murder-suicide on FaceTime  -- despite his very public spat with the boxer in September.

"RIP baby girl. Danced with me on tour and was always the coolest person," Chris Brown said in a now-deleted Instagram post. "My prayers go out to you and HAZE family."

Below are more celeb reaction at the horrific news:

ET recently spoke to actress and model Eva Marcille, who had been Moseley's long-time friend. Watch the video below to hear an emotional Marcille share her memories of Moseley.