Whitney Houston's cause of death was released yesterday, and it revealed that Houston had used cocaine before her death. The report also said Houston had 60 percent hardening of the arteries of the heart, heart disease, that could have caused the singer to have a heart attack resulting in accidental drowning.

The official cause of death was accidental drowning -- heart disease and cocaine were contributing factors.

It was also found that Houston had in her system marijuana, Xanax (an anxiety drug), Flexeril (a muscle relaxant), and Benadryl (an allergy medication). All the above-mentioned drugs were found at the scene, except cocaine. Police have not yet closed the investigation.

It's still an open investigation for us, Beverly Hills (Calif.) Police Lt. Mark Rosen told People Magazine when asked if cocaine was found in the hotel room. I can't disclose any details about the investigation.

Still in question is where the cocaine went, who could have given it to Houston, and who disposed of it.