Jackson's personal physician was convicted of causing the singer's June 2009 death by giving him a powerful anesthetic as a sleep aid, although investigators determined there was no criminal wrongdoing by seven other doctors who treated the singer.
Houston, a sensation from her first, eponymous album in 1985, was one of the world's best-selling artists from the mid-1980s to the late 1990s, turning out such hits as "I Wanna Dance With Somebody," ''How Will I Know," ''The Greatest Love of All" and "I Will Always Love You." But as she struggled with drugs, her majestic voice became raspy, and she couldn't hit the high notes anymore.
Only after the weeks-long investigation into her death is complete and a full autopsy report is released will the impact of drugs on the singer's body become known. Officials have cautioned against speculating too much about what killed the singer and downplayed the role prescription meds may have played in her case.
"There weren't a lot of prescription bottles," Winter, the coroner's official, said earlier this week. "You probably have just as many prescription bottles in your medicine cabinet."
Associated Press Writers Alicia Chang and Greg Risling contributed to this report.
Anthony McCartney can be reached at http://twitter.com/mccartneyAP. Follow Chang's coverage at http://www.twitter.com/SciWriAlicia
Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.