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Whitney Houston's sister-in-law: 'I was afraid' for her before death

March 9, 2012 |  4:30 pm

Whitney Houston in 2005

Whitney Houston's sister-in-law and manager said she had become concerned about the singer's behavior before she died last month in Beverly Hills.

"I saw her chasing a dream, you know, looking for love in all the wrong places," Patricia Houston told Oprah Winfrey in an interview to be broadcast over the weekend.  "Things were really changing with her. Very much so. It wasn't about substance abuse or anything like that ... it was just more of a lifestyle. I was afraid for other things."

The comments come as the L.A. County coroner's office and Beverly Hills Police Department try to determine how Houston died last month at a Beverly Hills hotel a day before the Grammy Awards.

Beverly Hills police officials have said they don't believe foul play was involved, but sources said investigators cannot pronounce a cause of death until all toxicology tests are back and detectives have concluded all interviews.

Investigators have served subpoenas on doctors and pharmacies as they try to determine whether prescription drugs played a role in the singer's death.

Authorities collected several bottles of prescription drugs from Houston's suite at the Beverly Hilton Hotel, where she was found dead Feb. 11 in a bathtub. But officials have said the amounts of drugs did not seem unusually large, leaving it unclear whether the medications had anything to do with the death.

PHOTOS: Whitney Houston, 1963-2012

The death certificate, released this month, says the manner of death was "pending investigation."

The sources, who spoke on the condition of anonymity because the case is ongoing, said that they don't know precisely when a cause of death will be determined but that it could be several more weeks.

-- Shelby Grad and Andrew Blankstein

Photo: Whitney Houston in 2005. Credit: Los Angeles Times