One such firing came when her bosses at Woodland Heights Hospital caught her stealing Demerol (which was found in her handbag) and cheating on a urine test.

[7][8] In the spring of 2008, DaVita's Lufkin clinic had an unusual spike in patients falling seriously ill during treatment.

The spike in Emergency Medical Service calls was especially unusual, since under normal conditions, dialysis patients rarely code.

[7][10] On April 28, 2008, with inspectors on site, two more patients (Marva Rhone and Carolyn Risinger) suffered severe drops in blood pressure.

Patients Linda Hall and Lurlene Hamilton subsequently testified that they saw Saenz draw a bleach solution into two syringes, then inject the substance into Rhone and Risinger's dialysis lines.

[8][6] Research by an epidemiologist at the Centers for Disease Control and Prevention revealed that Saenz had been present at every incident in April at which someone died.

[7] Another coworker, Sharon Dearmon, recalled that Saenz went on a cigarette break after tending to a patient, Opal Few.

[9] Despite the damning forensic evidence, as well as eyewitness accounts, police and Angelina County prosecutors initially feared they did not have enough for a conviction.

[4] The five murder victims were Clara Strange, Thelma Metcalf, Garlin Kelley, Cora Bryant, and Opal Few.

[13] District Attorney Clyde Herrington believed more victims existed than just the 10 indicted cases, based on CDC research.

[14] Lufkin Police detectives could only obtain medical waste from two weeks prior to April 28, 2008, so the evidence was inadequate to raise further indictments against Saenz.