Los Angeles, CA - A new report says Valium, Xanax and alcohol was the deadly mixture in Whitney Houston's system when she died in the Beverly Hilton Hotel on Feb 11.

While the coroner is awaiting final toxicology results to determine which was the catalyst in her death, the preliminary results have all but ruled out drowning even though she was found partially submerged in a bathtub.

According to a RadarOnline.com source, Houston’s “heart stopped beating because her respiratory system was suppressed” by the anti-anxiety medications.

The booze probably accelerated the suppression, the source said.

Valium and Xanax were recovered from her room following her death on the night before the Grammys.

Houston was spotted drinking heavily in the days leading up to her death. She often took Xanax to calm her nerves before a performance.