from latimes.com: Beverly Hills police officials said Wednesday that they will be able to wrap up their investigation into Whitney Houston's death after the Los Angeles County coroner released its final report Wednesday... The report found that Houston was submerged in bathwater for nearly an hour before a personal assistant found her dead in the Beverly Hilton Hotel. The report provided new details on the death of the 48-year-old singer who died of a combination of heart trouble and cocaine ingestion, the Los Angeles County coroner's office said in a 41-page final report... Investigators found a white, crystalline substance and spoon with residue in the Beverly Hills hotel room where Whitney Houston died in February, the report said.
It also showed that cocaine and heart disease contributed to her death. On a bathroom counter were "a small spoon with a white, crystal-like substance in it and a rolled-up piece of white paper, along with other miscellaneous items," it said. In a nearby drawer were "remnants of a white powdery substance and a portable mirror on a base and on the bottom of that base were more remnants of a white, powdery substance." Authorities collected several bottles of prescription drugs from Houston's suite at the Beverly Hilton Hotel, where she was found dead. But officials have said the amounts of drugs did not seem unusually large.
Houston had battled drug addiction for years, and the coroner's office found traces of several drugs — including marijuana, the anti-anxiety medication Xanax, the muscle relaxant Flexeril as well as Benadryl — in her system. But the coroner's office concluded in March in a preliminary report that those drugs did not contribute to her death. Cocaine did play a role, though officials would not say how much of the drug was in her system.