The Borgias (2011)

S9E1 The Case of the Laughing Lady

Carla Chaney finds herself in a tight spot, discovered at the murder scene of her former boyfriend. After three lawyers back out, Perry steps in to represent her without charge. Carla's only chance at proving her innocence rests on a mysterious woman she insists was there too. She describes this woman as having a chilling laugh, a detail that could turn the case around.