Gov. Mario Cuomo Friday denied clemency to Jean Harris, the former headmistress of an exclusive Virginia girl's school convicted of killing her longtime lover, Scarsdale Diet doctor Herman Tarnower.

Harris, 65, is serving a sentence of 15 years to life at Bedford Hills Correctional Facility, only 20 miles from the scene of the March 10, 1980, killing at Tarnower's estate in suburban Purchase, north of New York City.Harris, who has had two heart attacks and suffers from angina, had sought clemency on medical grounds. She became eligible in August.