Whitney Houston, the iconic American singer whose battles with drugs, alcohol and ex-husband Bobby Brown marred her star power, has died. She was 48.

Houston's publicist confirmed the singer's death to ABC News. The cause of death is not yet known.

Representatives from the Beverly Hills Police Department confirmed that the singer died in a hotel room at the Beverly Hilton hotel.

Police got a 911 call from hotel security at 3:43 p.m, P.I.O. Lieutenant Mark Rosen said. Efforts to revive her were unsuccessful and she was pronounced dead at 3:55 p.m. Houston's daughter, Bobbi Kristina, were among the people that were immediately notified of her death.

Rosen said Houston's cause of death has not yet been determined and no "obvious signs of foul play" have been seen.

Houston was scheduled to perform Saturday evening at a pre-Grammy Awards party for producer and mentor Clive Davis. The party went on despite the star's death, and the presence of numerous police vehicles, including a crime lab bus, outside the hotel.

Among the stars and celebrities who showed up for the party were singer Alicia Keyes, soul legend Gladys Knight, entrpreneur Richard Branson, and jazz great Herbie Hancock.

Houston's mother, Cissy Houston, and her cousin, Dionne Warwick, reportedly both spoke to the singer during the day and had no indication that anything was wrong.


Warwick spoke to her over the phone to check that they were seated at the same table at Davis' party and Cissy Houston talked to her at around 3:15, according to TMZ.

Just a half an hour later, someone in the singer's camp called 911, and she was pronounced dead 10 minutes later.

Houston was last photographed on Thursday, when she appeared disheveled and disoriented in front of the Tru Hollywood nightclub that played host to a pre-Grammy Awards party. According to the Hollywood Reporter, she got into an altercation with "X Factor" finalist Stacy Francis at the event, where she was said to be acting "belligerent." On Friday, she was partying loudly at the Beverly Hills Hilton, according to TMZ.

Houston returned to rehab in May of last year seeking treatment for drug and alcohol dependence. "Whitney voluntarily entered the program to support her long-standing recovery process," her publicist said at the time.

The six-time Grammy winner staged a comeback in 2009, but was dogged by rumors that she was using drugs again. That year, she told Oprah Winfrey that marijuana laced with cocaine was her substance of choice during her 1992 to 2006 marriage to R&B singer Bobby Brown. They have a daughter together, Houston's only child, Bobbi Kristina Houston Brown.

Houston's appearance on "Oprah" was her first major television interview since 2002, when she talked to ABC News' Diane Sawyer.