02/13/2012 AT 02:45 PM EST
Filling in some details of the timeline of Whitney Houston's death
, Beverly Hills police said Monday the singer was discovered on Saturday by "a member of her personal staff" in the bathtub of her Beverly Hilton suite.
"She was underwater and apparently unconscious," says a police statement. "Ms. Houston was pulled from the tub by members of her staff and hotel security was promptly notified."
The singer was found at 3:25 p.m., and Fire Department personnel and hotel security responded and found Houston "to still be unconscious and unresponsive," says the police statement.
"They initiated CPR, but were unable to revive her," says the statement. "At approximately 3:55 pm. Whitney Houston, age 48, was pronounced dead at the scene."
Following an autopsy on Sunday, Houston's body was released by the coroner Monday for the family. No cause of death has been determined while toxicology tests are being conducted. All information about the autopsy, including reports that water was found in her lungs, remains under seal.
"As can be expected in a high-profile incident such as this, there have been many rumors circulating and much speculation by the media and the public," says the police statement. "In order to minimize such speculation, the Beverly Hills Police Department has asked the coroner’s office to place a security hold on their findings until they have a complete and final report prepared."
Reporting by KEN LEE