【听新闻练听力】Houston's cause of death unknown

-->>>> music's shining stars has been dimmed, gone too soon. barely 24 hours after singer whitney houston's lifeless body was discovered in a beverly hills hotel, fans and fellow entertainers are still struggling to find the right words that truly capture her remarkable voice and the depth of her impact on popular music. and tonight, on what should be the music industry's brightest night, the grammys, we're left to wonder if whitney houston ever overcame the demons that haunted her life and career. nbc's kristen dahlgren is outside the beverly hilton hotel to begin our coverage. good evening.

>> reporter: good evening, lester. whitney houston was supposed to be staying here for her mentor, clive davis' famous pregrammy party. instead this is where she died. and as hollywood mourns, investigatesers are trying to piece together the star's final moments. the call came in at 3:43, pop superstar whitney houston was unresponsive.

>> when our officers arrived in the hotel room on the fourth floor, the fire department and hotel security were already attempting resuscitation measures.

>> reporter: less than 15 minutes later --

>> whitney houston was pronounced dead.

>> reporter: as stars gathered downstairs at the pregrammy party houston was supposed to attend, upstairs officials began their investigation into her death.

>> most of the people say it was her bodyguard that found her and they found her in the bathtub.

>> reporter: officials still won't reveal detail, only that there were no obvious signs of criminal intent. nine hours after the 911 call, houston's body was taken to the coroner's office.

>> we'll be doing a full autopsy along with toxicology to try to determine if there were any substances in her body at the time of her death.

>> reporter: houston admitted she struggled with drug use.

>> if she was having a good day, you knew. if she was having a bad day, you knew. she couldn't really hide it.

>> reporter: cell phone video captured the singer's last public performance on thursday, on stage with kelly price, the pop star sounded hoarse.

>> she danced. she sang. she laughed.

>> reporter: later that night, houston left looking disheveled. photos appear to show her leg dripping with blood. but instead of the lows, hollywood is remembering houston's high notes.

>> that voice, oh, my god, no one has ever come close to that voice.

>> i am personally devastated by the loss of someone who has meant so much to me for so many years.

>> reporter: across the internet, the outpouring was almost instant, mariah carey tweeting, i am heart broken and in tears. tony bennett calling her the greatest singer i've ever heard. on stage in mississippi, her ex-hu*****and bobbi brown w yibobby brown w as emotional as he asked the crowd to pray for him and his daughter bobbi kristina where she was rushed to the hospital to be treated for stress. the associated press is reporting that bobbi kristina has been released from the hospital. this emotional day expected to continue. jennifer hudson will be singing a tribute to whitney houston at tonight's grammy awards.

>> kristen dahlgren, thanks. whitney houston's

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