London, October 31 Former Playboy Playmate Anna Nicole Smith's ex-boyfriend and two doctors are set to go on a trial amid accusations that they illegally supplied her with prescription drugs.

Smith was found unconscious in her room at the Seminole Hard Rock Hotel and Casino near Hollywood, Florida, in February 2007.

A post-mortem report said the American model died of an accidental overdose of prescription drugs including anti-depressants, reports Sky News.

Her former lover Howard K Stern and his associates Dr. Khristine Eroshevich and Dr. Sandeep Kapoor, were charged with conspiracy to feed the star's drug addiction.

And now, they are to stand trial after a judge in Los Angeles made the ruling based on a hearing to determine if there was enough evidence against them.

All the three defendants have pleaded not guilty. (ANI)