A judge ruled Thursday that there's enough evidence to proceed in the case against 56-year-old Dr. Martin MacNeill.
Michele MacNeill's body was found in a bathtub in 2007 at the couple's Pleasant Grove home.
Prosecutors claim her husband gave her a lethal dose of medicine so he could continue another affair. They say MacNeill hounded his wife to get a facelift and got the plastic surgeon to prescribe a "potent cocktail" of pills for her recovery.
But medical examiners differ on her cause of death. It was initially ruled natural and now is called "undetermined," but the state coroner's office has never ruled it a homicide.
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