After an infant is found dead in his crib, it's determined he was poisoned, and all evidence points to the child's au pair.

Annika Peterson, Charlie Hofheimer, Chris Messina, Dennis Parlato, Diane Tyler, Ed Hodson, Joel Blum, Keith Jochim, Kim Raver, Leslie Ayvazian, Linda Powell, Maria Cellario, Michael Genet, Michael Mislove, Patti LuPone, Phil Parolisi, Rosemary DeAngelis, Tracy Thorne