As new episodes of Accident, Suicide, or Murder return, Dr. Priya Banerjee M.D. says there's one "invaluable" way to glean how a person died, and it may not be what you think.
Although doctors and nurses long suspected an employee of poisoning patients at a Missouri hospital, it took another look at the case from a police officer 20 years later to lead to the arrest of Jennifer Hall for murder.