Whitney Houston was found dead in the Beverly Hilton hotel bathtub of her room.
Whitney's entourage discovered her unresponsive and called hotel security, who then called 911.
No illegal drugs have been found in the hotel room where Whitney Houston died -- at least not yet -- but prescription drugs were present, and it's possible the singer drowned in the bathtub ... TMZ has learned.
Sources tell us ... when EMTs arrived Whitney's body was already removed from the bathtub so it will take an autopsy to determine if she OD'd, drowned or died from some other cause.
Informed sources tell us ... Beverly Hills cops -- who were still searching the room at the time this story was posted -- found various pill bottles. There was no evidence that Whitney was drinking alcohol in the room.
Whitney's body was just removed from the room on a gurney. It will go to the morgue for an autopsy to determine cause of death.
The singer famously battled drug addiction for years.
Houston won two Emmy Awards, six Grammy Awards, 30 Billboard Music Awards, 22 American Music Awards during her record-breaking career. Her album "Whitney" was the first female album to ever debut at #1 on the Billboard Charts. She has sold 200 Million albums world wide.
Houston holds an Honorary Doctorate in Humanities from Grambling State University in Louisiana.
Houston had one child, Bobbi Kristina, with husband Bobby Brown. Houston and Brown were married from 1992-2007.
Story developing ...
*Update* CNN is reporting that Ray J found her dead at the Beverly Hilton Hotel.
She was spotted with Ray J last weekend, check out the video below...
