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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 REPORT: Bobbi Kristina Got High After Whitney Houston’s Funeral ||||| The coroner's investigation into the death of Whitney Houston came to a close Wednesday with a final autopsy report that described the singer submerged face-down in hot water in the bathtub of her Beverly Hills hotel suite with a unidentified white powdery residue left in a spoon on the bathroom counter.The report released Wednesday confirmed that the 48-year-old singer drowned in a bathtub, with heart disease and cocaine use listed as contributing factors. It concluded that Houston's death was accidental.A personal assistant found her dead in the Beverly Hilton Hotel, the report said. The water was described as "extremely hot," and the singer had scalding burns when she was examined.Houston was last seen alive by her personal assistant Feb. 11 between 2:45 p.m. and 3 p.m., the report stated.The singer had complained of having a sore throat in the days leading up to her death. Before the assistant left, she told Houston to "take a bath to start getting ready for tonight," referring to a pre-Grammy party thrown by her mentor, producer Clive Davis.The personal assistant left to pick up items at Neiman Marcus and returned to the locked hotel room at 3:36 p.m. When she went into the bathroom, she found Houston face-down and unresponsive in the tub, the report stated.She called out to a bodyguard, the report stated, and they pulled Houston out of the bathtub. The assistant ran to call the front desk and told them to call 911.On a counter in the bathroom, investigators found an ashtray filled with cigarette butts and a "small spoon with a white crystal-like substance in it, and a rolled-up piece of white paper." They also found prescription drug bottles on the counter and a small plastic bag that had been ripped open. In a drawer, they found a portable mirror with more remnants of a white, powdery substance. Coroner's officials said they did not test the powder, saying that was a job for police. The Beverly Hills Police Department did not release any information about the substance Wednesday.Houston had battled drug addiction for years, and the report found that she had a perforation in her nose typical of habitual cocaine users. Toxicology test results showed that she had cocaine in her system at the time of death. The coroner's office also found traces of several other drugs — including marijuana, the anti-anxiety medication Xanax , the muscle relaxant Flexeril as well as Benadryl — in her system.Dr. Nachman Brautbar, a toxicologist and professor emeritus at USC who reviewed the toxicology report, said the level of cocaine in Houston's system was not at a toxic level. He estimated that she had taken the cocaine two hours or more before getting in the tub.Brautbar said none of the drugs on their own were at a toxic level, but the combination might have contributed to her losing consciousness and slipping under water."The combination was toxic for her," he said.The release of the report also means that police will be able to wrap up their investigation into Houston's death. Lt. Mark Rosen, a spokesman for the Beverly Hills Police Department, said the investigation had been on hold pending release of the final coroner's report.
– 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.)