Whitney Houston: No cause of death has been determined
Investigators probing the death of Whitney Houston continue to gather evidence and have not determined an official cause of death, sources said Tuesday.
The sources, who spoke on the condition of anonymity, said it is not known when a final determination in her death will be made. But it will occur only after all toxicology tests are completed along with interviews with family, friends and doctors.
The death certificate, released this month, states that the manner of death was "pending investigation."
Authorities collected several bottles of prescription drugs from Houston's suite at the Beverly Hilton Hotel, where she was found dead Feb. 11. 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 singer's death.
Houston was found in a bathtub at the hotel a day before the Grammy Awards.
Investigators have served subpoenas on doctors and pharmacies as they try to determine whether prescription drugs played a role in her death.