What killed Whitney Houston is still an official mystery despite widespread media speculation, but a Los Angeles County coroner official downplayed the suspicion that drugs played a major role Monday.

Assistant Chief Coroner Ed Winter said that "not many prescription bottles" were found in the singer's Beverly Hilton hotel room after her death. The amount of medications recovered by investigators was less than usually present in deaths attributed to overdoses, Winter said.

"I know there are reports that she maybe was drowned or did she overdose, but we won't make a final determination until all the tests are in," he said. Winter ruled out foul play and said there were no injuries to her body.

There were more questions than answers Monday about Houston's sudden death, as authorities were offering few details. The singer's soaring voice and impressive talent had taken a back seat in recent years to her struggles with drug addiction.

With the autopsy completed Sunday, Houston's body was released to her family Monday, Winter said.

Los Angeles police deployed around the Van Nuys, California, airport Monday afternoon to provide traffic control support for the expected arrival of Houston's body for a flight, and Winter later said it was his understanding that the body was in a jet that had departed from the Van Nuys airport.

A source close to Houston said Monday that her body will be flown to her native New Jersey, and a funeral service will be held there Friday or Saturday.

Authorities have not released a cause of death pending toxicology tests, which should be be available in six to eight weeks.

"We do not know (the cause) yet," Winter said. When it is known, the coroner's office will notify police and Houston's family, he said.

Winter said Sunday that no additional details, including what was discovered in Houston's room, would be released.

Beverly Hills police have requested a "security hold" on the coroner's report, a common practice in high-profile cases that limits what can be revealed about an investigation while it is ongoing.

Asked how long Houston had been dead before she was found, he said she was seen by someone -- a family member or someone at the hotel -- within an hour of her death.

Winter confirmed reports that Houston was found in the bathtub of her hotel room. "I believe somebody removed her from the bathtub and the paramedics did CPR on her," he said Sunday.

Paramedics found Houston "unconscious and unresponsive" when they arrived and she was pronounced dead after several minutes of resuscitation efforts, Beverly Hills Police Lt. Mark Rosen said Monday.

The police are conducting a "normal" death investigation, not a criminal probe, Rosen said.

"We have not ruled anything out at this time," Rosen said. "Everything is on the table."

A singer who participated in an impromptu duet with Houston at a party two days before Houston's death said Monday that she noticed nothing amiss and the superstar was "upbeat and joyful."

"She did not seem disheveled. She was dancing; she was laughing. ... We were having a good time," said Kelly Price.

"What I saw on Thursday night was not erratic behavior. I didn't see someone who was high."

Price said the party was held to celebrate her Grammy nominations. During the party, Houston took the stage unexpectedly and sang a hoarse rendition of "Jesus Loves Me" with Price.