Okay, lets assume for a moment that the radio station is negligent, even grossly negligent. Wouldn't this same negligence also apply to the woman? After all, she was not forced to consume a fatal amount of dihydromonoxide, she did so of her own free will. She voluntarily entered the contest and no one forced her to participate.
I see these sorts of frivolous law suits and their consequences everywhere I look. They are killing the general aviation industry, the medical industry, and business as a whole because businesses are having to cover themselves for every conceivable circumstance where some dipwad will misuse their product, like trying to use a hair dryer in the bathtub. It has gotten to the point where you simply cannot buy sufficient insurance coverage to protect yourself against this sort of crap.
Support this if you want, but ultimately you will pay the price in higher insurance premiums and higher cost for products. Ultimately, the only ones who really win are the lawyers.....and that is no accident.
My guess is all the contestants had to sign some sort of contract indicating the radio station would not beheld liable in case of accident/injury.