Whitney Houston fans on Thursday, learned that the singer died of atherosclerotic heart disease combined with what is now said to be chronic cocaine use and Ray J has said he didn't know Houston was using.

MTV News is reporting that Bobby Brown's sister, Leolah, told Dr. Drew that she saw Ray J leaving Houston's hotel room in a hurry the night the singer died. Houston, 48, died on Feb. 11 at the Beverly Hilton hotel in California.

I saw Ray J coming out of the hotel, hiding his head, being pushed into the car, Leolah Brown told Drew, as reported by MTV News. Why? I looked and I said, 'why is he hiding his face?' He's always trying to show his face when he's around Whitney. Why now? Why are you trying to hide now Ray J?

Leolah reportedly claimed that Ray J was not Houston's boyfriend but her runner boy who allegedly fetch the singer's drugs. However, Ray J denied the allegations by way of his spokesperson.

His rep told TMZ that Ray J had no knowledge that Houston was using cocaine again. Furthermore, reports were that Ray J was never around when Houston died because he was in San Diego.

The rep says Ray J is especially upset at claims made by Bobby Brown's sister, Leolah Brown, who went on TV Thursday night and suggested Ray J was to blame for Whitney's demise, TMZ reported. Ray J says the claim is absolute B.S.

Houston and her ex-husband Bobby Brown battled drug use for years. Drugs was also a factor in their marriage ending in 2007. Houston twice went to rehab before confessing to Oprah in 2009 that her cocaine and marijuana use took over her life. Both were found in her system after she died.

Los Angeles County Coroner's chief, Craig Harvey, told ABC News that the findings in the office's preliminary toxicology were:

We had approximately a 60 percent occlusion in the arteries, in the narrowing of the arteries, Harvey said. So, that condition, complicated by the chronic cocaine use, all combined to result in her drowning. The final cause of death has been established as drowning due to atherosclerotic heart disease and cocaine use.

According to the National Institutes of Health, atherosclerotic heart disease is when there is a build-up of plaque, narrowing the small blood vessels supplying blood and oxygen to the heart.