Whitney Houston's Death: All the Latest Details

The singer's 18-year-old daughter Bobbi reportedly suffered a "complete breakdown" and was hospitalized after her mother was found unresponsive in her hotel bathtub

As the world reels from the shocking news of music legend Whitney Houston's death Saturday night at the age of 48, police are working to determine the cause and circumstances under which the six-time Grammy winner passed away. One thing they've figured out thus far: There is nothing to suggest that foul play was involved.

"At this time, there's no obvious evidence of foul play or cause of death," Beverly Hills Police Lieutenant Mark Rosen tells People.

Earlier on Saturday, Rosen confirmed to the magazine that Houston was pronounced dead at 3:55 p.m. Saturday afternoon after "someone in her entourage found her unresponsive in her room" at the Beverly Hilton Hotel.

"An attempt was made to resuscitate, to no avail." Rosen added. As for whether there were any drugs in the room or suspected in the singer's death, Rosen could only say, "We don't know yet. Her death is under investigation."

Sources, meanwhile, tell both People and TMZ that Houston was found partially submerged in the bathtub of her hotel room, suggesting that Whitney might have lost consciousness and accidentally drowned. TMZ adds that Houston's autopsy was completed Sunday, but results will be deferred four to six weeks until toxicology results are in.

Compounding the sadness of an already tragic event, a source confirms to People that Bobbi Kristina Brown, Whitney's 18-year-old daughter with ex Bobby Brown, was in the lobby of the Beverly Hilton when her mother was pronounced dead. According to the source,  an inconsolable Bobbi was taken to Cedars Sinai Medical Center at 11 p.m. Saturday evening because she was "having a complete breakdown." And, to make matters even worse, the Beverly Hills Fire Department has reported that Bobbi was rushed to the hospital for a second time at 10:30 a.m. Sunday.

Her father Bobby Brown, meanwhile, was in Southaven, Miss., to perform a concert when he learned of Whitney's passing Saturday night. While he soldiered on with the show, Brown broke down in tears multiple times during the performance and at one point telling the audience: "First of all, I want to tell you that I love you all. Second, I would like to say, I love you Whitney. The hardest thing for me to do is to come on this stage." According to TMZ sources, Brown has canceled a concert scheduled for Sunday and is en route to Los Angeles to be with Bobbi.

While a cause of death has yet to be officially established in Houston's passing, a close friend of the embattled singer -- who has grappled with addiction in the past and checked into rehab as recently as May 2011 -- tells People that the singer had lately been struggling both emotionally and mentally.

"Her voice was ruined, and her comeback wasn't what it was supposed to be, because her voice wasn't what it used to be," says the pal.

Houston had just finished filming the musical drama Sparkle opposite American Idol alum Jordin Sparks. The film, which is due for release in August, was her first big-screen role in 15 years and was being billed as the launching pad for a big comeback.

"(Whitney) was in pain from all the pressure she was facing," adds the friend. "I know from when she was recording her most recent album -- her comeback album (I Look to You in 2009) -- her voice was shot. That bothered her."

Whatever the cause of Houston's death, there's no denying the gaping hole that it has left in the lives of her loved ones and the music world.

Celebs, including Mariah Carey, expressed their sorrow on Twitter. "She will never be forgotten as one of the greatest voices to ever grace the earth," Carey wrote.

And music producer Clive Davis, honored the late singer with a moment of silence at his annual pre-Grammy bash, which Houston was to have attended Saturday night.

"Whitney was so full of life. She was so looking forward to tonight," Davis told partygoers, shortly before asking them to join him in a moment of silence. "She loved music and loved this night that celebrated music. Whitney would have asked that the music go on. And her family said the show should go on."

And go on it will. Grammys producer Ken Ehrlich tells The Los Angeles Times that singer Jennifer Hudson will perform a "respectful musical tribute" to Houston during Sunday night's CBS telecast.

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