2x6 - Murder, She Wrote

Jessica decides to pay a visit to her long-time friend Francesca, only to learn that Francesca, who is now married to a much younger man, is convinced that she is being haunted by the ghost of her first husband, Ross. When her new husband, Scott, turns up dead, the investigation reveals that he had been poisoned, and suspicion turns to Francesca. Jessica, however, is determined to prove that her friend did not commit the crime, and begins looking into the mysterious re-appearances of her dead husband.