Vera Maresova , 50 , killed one women and five man over a four-year period . Police said she committed the murders to make her workload easier . Maresova , who has been dubbed 'Nurse Death locally , has admitted killing the victims with massive doses of potassium . Drug caused the elderly patients ' hearts to fail and eventually killed them .
Vera Maresova , 50 , killed five women and one man over a four-year period . Police said she committed the murders to make her workload easier . Maresova , who has been dubbed 'Nurse Death locally , has admitted killing the victims with massive doses of potassium . Drug caused the elderly patients ' hearts to fail and eventually killed them .