UPDATE: Chaka Khan Won't Perform at Grammys

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Although sources told ET Saturday that Chaka Khan would join Jennifer Hudson in a tribute to Whitney Houston at the Grammys, Khan tweeted Sunday, "As I grieve the loss of my friend and "little sister," I don't feel it appropriate to perform at this time. Continue to pray for the family."

Jennifer Hudson is still lined up to perform a tribute. Keep checking back here for the latest Grammys news as it comes in.

Whitney Houston Dead at 48

The music legend died Saturday at age 48. Houston was pronounced dead at 3:55 p.m. at the Beverly Hilton Hotel in Beverly Hills, California where she was a guest, Beverly Hills Police lieutenant Mark Rosen confirmed in a briefing. Police received a call at 3:43 p.m. from hotel security, and although Beverly Hills fire and police responded minutes later, attempts to resuscitate her were unsuccessful.

The cause of death is unknown, and is currently under investigation. According to Rosen, there was "no obvious evidence of foul play or cause of death."

ET's Last Interview with Whitney Houston

Often referred to as the "Queen of Pop" or "the Voice," Houston is a six-time Grammy winner and the most awarded female act of all time, though her career was overshadowed in the later years with her rumored drug use.