Board Thread:Show-Related Questions and Answers/@comment-5989182-20131209030916/@comment-1894786-20140317063403

I don't think Regina ever told Snow, but Snow definitely figured it out. She throws it in Regina's face just before biting into the apple in Apple Red As Blood, and proclaims it to villagers in Lost Girl. Considering she even knew that Graham was sent to kill her in The Heart Is A Lonely Hunter, like two or three days after Regina killed him... She had to have known.