Texas Nurse Is Found Guilty of Killing 4 Patients by Injecting Them With Air. Serial Murders, Nursing and Nurses, Decisions and Verdicts, Davis, William George (Nurse), Clark, Ronald Jay (d 2017), Greenaway, Christopher (d 2017), Kalina, Joseph (d 2018), Lafferty, John (d 2017), Tyler (Tex), Texas