According to Cady McClain, her All My Children character was killed off as an act of revenge.
Rather than her character dying due to a vengeful character, however, McClain says a writer wanted to exact vengeance for an interesting reason.
Soap operas are notorious for delivering just about as much melodrama and wild twists as can be produced for the small screen, but one All My Children star has made a claim that is pretty soapy in real life.