By Jen Heger – Radar Legal Editor 
 
 Whitney Houston had a deadly mixture of Valium, Xanax and alcohol in her system when she tragically died at the Beverly Hilton Hotel almost two weeks ago, RadarOnline.com is exclusively reporting. 
 
 As previously reported, Valium and Xanax were recovered from the pop icon’s hotel room following her death. 
 
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 “Whitney had taken Valium, Xanax, and alcohol, which led to her death. The coroner is waiting on final toxicology results to determine which one of the three was the major contributing factor of her demise,” a source close to the situation tells RadarOnline.com. “The coroner will be closely examining Whitney’s blood alcohol content at the time she died as well. The sedatives and alcohol will almost certainly be the cause of death, and not drowning. Her heart stopped beating because her respiratory system was suppressed because of the anti-anxiety meds, and combined with the booze it probably happened very quickly before she was found partially submerged in the bathtub.” 
 
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 Houston’s final days were marred by scandal after she became involved in an altercation at a Hollywood nightclub with another woman, whom she thought was flirting with her boyfriend, Ray J. The 48-year-old was at Tru Hollywood nightclub to support her friend, Kelly Price, who was having a party to celebrate her Grammy nomination. When Price acknowledged her presence, Whitney joined the stage and began to sing Yes, Jesus Loves Me. 
 
 The pop star emerged from the nightclub that evening looking disheveled, intoxicated, and had blood running down her leg. Eyewitnesses have said Whitney was drinking heavily and doing tequila shots in the VIP area. 
 
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 The final toxicology results for Houston should be released in the next several weeks. 
 
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 Whitney Houston Taking Xanax 
 
 was taking Xanax ... evidence she may have fallen asleep in the bathtub where she died ... TMZ has learned.Family members of Whitney tell us the singer had a prescription for the drug, which is commonly used to treat anxiety and depression.We told you yesterday ... the night before Whitney died, she had been drinking a lot . Xanax mixed with alcohol can cause severe sedation, which could cause someone to fall asleep in a bathtub.As TMZ first reported, Whitney was found in the bathtub and removed before EMTs arrived. The L.A. County Coroner will perform an autopsy -- possibly today -- to determine if Whitney died from drowning, and OD or other causes.As we previously reported, Beverly Hills cops obtained a search warrant and found various prescription bottles -- but, as far as we know, no illicit drugs.
– Whitney Houston was killed by a combination of Valium, Xanax, and alcohol, an insider tells Radar. All three were found in her system, but the coroner is still waiting for toxicology results before the "major contributing factor of her demise" can be determined, the source says, adding that drowning is almost certainly not to blame: "Her heart stopped beating because her respiratory system was suppressed because of the anti-anxiety meds, and combined with the booze it probably happened very quickly before she was found partially submerged in the bathtub." (In other Whitney news, sources say Bobby Brown is shopping a tell-all about their life together.)