The ruling Friday in Los Angeles follows a three-week preliminary hearing to determine if there was enough evidence to try Howard K. Stern, Dr. Sandeep Kapoor and Dr. Khristine Eroshevich. All three pleaded not guilty.
The hearing delved deeply into Smith's troubled life and the role the defendants allegedly had in feeding her drug addiction before she died of an accidental overdose in 2007.
Prosecutors tried to show the doctors blurred the line between being physicians and friends to the celebrity model.
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