Whitney Houston Autopsy Results

Coroner's report says singer drowned but had also used cocaine.
2:45 | 03/23/12

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Transcript for Whitney Houston Autopsy Results
Tragic death the Whitney Houston -- Los Angeles coroner's office revealing what killed the superstar singer found underwater in her hotel bathtub on February 11. The report showing she had used cocaine. Before her death and ABC's Jim -- -- joins us with much more. On this attractive. It's a typical -- -- good morning Robin Beverly hills police tell ABC news overnight there will be at least two weeks before they officially closed their investigation. One of the key questions they must be looking at today is where the cocaine where is it. If the coroner says Whitney Houston was a chronic abuser and -- -- quiet up until she editor death bath. What happened to the residue the paraphernalia. The autopsy report shows Houston drowned in her hotel tub. Water found in her lungs no signs of foul play. We know that when she slipped under the water she was still alive we believe that something happened that caused her to. Go down. That's something the reports suggest hard weakened by 60% blockages of our arteries and cocaine found in her system. Used just that day. It appeared that the cocaine had been used in the time period just probably immediately prior to her collapse in the -- bathtub. Photos obtained by TMC of Houston's hotel room the afternoon -- death shows signs of drinking even a snack by the tub. But investigators found no cocaine in the sweet. They did -- and prescription drugs in her room and the corners report found them in her system including xanax and Benadryl even marijuana. Police questioned her doctors and pharmacists about that but the corners report says those drugs had nothing to do with her death. Late Thursday Houston's sister in -- on manager pat Houston. Issued this statement we are saddened to learn of the toxicology results. Although we are glad to now have closure perhaps most devastating for fans despite assertions from Houston's family and Houston herself. At the former addict had stopped using. The corners report tells a very different story. Toxicology findings suggest. Chronic usage. Doctor group and diction specialist and host of doctor drew on HLN. Says while the official cause of death may be drowning Houston died from her -- The cocaine probably caused some sort of cardiac arrhythmia or damage to the heart muscle. Which resulted in her losing blood pressure and consciousness and slipping into the water and drowning. The LA coroner's office shared its findings with police on Wednesday and while Beverly Hills PD released a statement saying that no foul play is suspected. Investigators tell ABC news the case is not close until their final report is written. And that is expected in two weeks -- -- -- and thank you.

This transcript has been automatically generated and may not be 100% accurate.

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