Whitney Houston wasn't high when she fell off Oprah's stage, at least not according to her bodyguard ... and he says he would know because he was there for it all.
Ray Watson sat down with TMZ's Charlie Neff to recall the moment the iconic artist took a tumble during her 2009 appearance on Oprah's talk show.

He says she was coming towards the front of the stage and couldn't see the edge ... and that's why she went down.
Ray explained the edge of the stage was in a dark spot and someone had tried to call out for her to be careful, but no luck.
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