She was hired to nurse them back to health...instead, she took their lives. For months, the DaVita Dialysis Center in Lufkin, Texas had been baffled by the rising number of deaths and injuries occurring in their clinic. In April alone, they'd rushed thirty-four patients to the hospital. But no one expected such a horrific cause to be behind it all. Kimberly Clark Saenz was a well-liked licensed vocational nurse at the center. The East Texas nurse...