Diagnosis: Unknown

Texas nurse Genene Jones administered lethal doses of muscle relaxant because she enjoyed the fight to save the victims. Why did 47 people die before she was caught?

After two children brought to an emergency room are diagnosed with meningitis, a school district goes on alert.

Kentucky nurse Donald Harvey brought death, not life to many of his patients as he dealt out dangerous drugs. Bosses became suspicious when his death toll mounted.

Dr Harold Shipman was known as a dedicated local GP, but secretly, he'd been bumping off an estimated 260 elderly patients for over 23 years.

Reverend Dwight Moore is seriously ill in hospital. His devoted wife Blanche waits at his beside until doctors discover that her cooking contains a deadly ingredient.

A rich cardiologist is admitted to hospital with a violent stomach illness. As doctors battle to save him, he finds packets of toxic castor beans in his wife's purse.