two young children murdered by their nanny. looking for children and enters the bathroom and finds her six year old daughter and her two year old son stabbed to death in the tub. gretchen: dr. marina crim returned to the apartment with her three year old dauter after the nanny didn t show up for swimming lessons with the children. she found the children in the bathroom. the nanny stabbed them. the children s father was notified when he was in the airport. they are accused of getting more than wrumb zumba lessons in a dance studio in