Toxicologist Rossum killed her husband with what prosecutors called "the perfect poison" and then, borrowing from a scene in her favorite movie, scattered rose petals around his body.

Drew Peterson arrives at the Will County Courthouse in Joliet, Ill., for his arraignment on charges of first-degree murder in the 2004 death of Kathleen Savio.

Dr. Samantha Tolliver is the Chief Toxicologist at the Office of the Chief Medical Examiner in Washington, D.C.--and the first Black woman in the role.