Sources told US entertainment website TMZ that Houston's stylist, hairdresser and two bodyguards became worried about the singer, because she had been in the bathroom for more than an hour and needed to get ready for the pre-Grammy awards party.

When the hairdresser went to check on her she found her in the bathtub with her face below the water.

Houston's bodyguards immediately pulled her out and attempted CPR, but when paramedics arrived on the scene soon after she was pronounced dead.

Initial reports suggested that Houston had drowned after falling unconscious, but police have reportedly found evidence of drug use.

Law enforcement officials have reportedly told the TMZ that Houston could have had a heart attack caused by an adverse reaction to her meds found in her room including ibuprofuen (a painkiller) and Xanax (an anti-depressant).

An autopsy has been performed, but police investigations are continuing.

Meanwhile, Houston's 18-year-old daughter Bobbi Kristina Brown was rushed to an LA hospital on Monday, reportedly suffering anxiety while her father Bobbi Brown broke down in tears at a performance on Saturday night after hearing the news of his ex-wife's death.

Brown shouted "I love you, Whitney!" and blew a kiss to the sky, Us Magazine reported.

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