It was January 2011 and Ellen Greenberg had just sent out save-the-date notices for her wedding when the unthinkable happened. Her fiance, Sam Goldberg, found 27-year-old Greenberg with 20 stab wounds, 10 to the back of the neck, one to help scalp, eight to her chest and a vicious slash across her abdomen. The knife was still lodged in her chest. But with no forced entry and no defensive wounds, Greenberg's death was ruled a suicide. It's a decision that still haunts her parents.