Whitney Houston Found By Assistant in Bathtub

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ET has learned new details about music legend Whitney Houston's death.

A source close to Whitney tells ET that Whitney was found by her assistant in the bathtub. When her 18-year-old daughter Bobbi Kristina was told that her mother had passed away, she was hysterical and had to be sedated.

Whitney Houston Dead at 48

Whitney's ex-husband, Bobby Brown, was en route from Memphis to Los Angeles as of Saturday night.

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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 Beverly Hills fire and police, who were already on the scene at the hotel due to the pre-Grammy event taking place later in the evening -- responded minutes later. Upon arrival, first responders discovered Whitney Houston "unresponsive." They initiated CPR, but attempts to resuscitate her were unsuccessful.

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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."