No 'signs of trauma,' but few other details on Whitney Houston's death
Questions swirled Sunday about what caused iconic singer Whitney Houston's sudden death, with authorities offering little information at a time when many were still struggling to come to groups with the news.

While an autopsy was complete as of late Sunday afternoon, Assistant Chief Ed Winter of the Los Angeles County Coroner's office said it could take six to eight weeks before the results are in on toxicology and other tests.

"There was no visible signs of trauma, and foul play is not suspected at this time," Winter said, adding that "the cause of death right now is deferred."

More official details on the investigation aren't expected to surface anytime soon, after the Beverly Hills, California, police department was granted a "security hold." Common in high-profile cases, this puts limits on what can be revealed about a probe.

Authorities have said that police and fire officials were called to Houston's room at the Beverly Hilton Hotel at 3:43 p.m. Saturday after her bodyguard found her unconscious body in a bathtub.

Winter, from the coroner's office, said Houston was removed from the tub before paramedics performed CPR. She was pronounced dead at 3:55 p.m.

Pill bottles were found at the scene, entertainment news website TMZ reported, citing "informed sources." CNN could not immediately confirm the TMZ report and Winter declined to comment.

Whatever the exact cause, the grief about the death of Houston -- whose soaring voice and enormous talent were clouded in recent years by her battles with drug addiction -- was evident Sunday at the 54th annual Grammy awards show, which is typically the biggest night on the music industry's calendar.

After a performance by Bruce Springsteen, Grammy host LL Cool J began his monologue by acknowledging "we've had a death in our family" and offering a prayer thanking God "for sharing our sister Whitney with us."

"Although she's gone too soon, we remain truly blessed to have been touched by her beautiful spirit and to have her lasting legacy of music to cherish and share forever," the rapper and actor said.

Earlier, on the red carpet, Kim Burrell told CNN she'd exchanged voicemails with her good friend Houston shortly before her death, describing her as being "in great spirits, as always." She always thought of Houston as a "fighter" and a "survivor," which made the idea of her passing all the more difficult to comprehend.

"She's my sister and she'll always be my sister," said an emotional Burrell, herself a singer. "I love her dearly."

Burrell said she'd flown to California to join Houston in attending a pre-Grammy party Saturday night hosted by the songstress' longtime mentor, Clive Davis.

Houston never made it, dying at the age of 48.

Amid the outpouring of grief, Beverly Hills police said Houston's 18-year-old daughter, Bobbi Kristina, was taken to Los Angeles' Cedars-Sinai Medical Center, at about 11:15 a.m. Sunday. Details of her condition were not disclosed.

A source close to the family told CNN that by late Sunday afternoon the teenager was out of the hospital and would be heading back to New Jersey possibly as early as Sunday night. She was expected to go to the home of her grandmother, gospel singer Cissy Houston, in New Jersey, the source said.

Bobbi Kristina Brown was born during Houston's marriage to R&B singer Bobby Brown, which ended in divorce in 2007. Burrell said she was with the teenager late Saturday, admitting the girl had felt "overwhelmed" while expressing confidence that "she'll pull through."

Her father, Bobby Brown, did not perform at a scheduled New Edition concert Sunday night in Nashville in the wake of his ex-wife's death, said Candy Lowd, a promoter for the concert.

The previous night, he was openly emotional during a concert in Southaven, Mississippi, said attendee and CNN iReporter Moshiu Knox, at one point asking people to say a prayer for his daughter, for his mother and "for me, because I'm going to need it."