The fatal accident occurred at 5:30 p.m. on Loring Road, detectives said.
Gerhard Frobart, 89, of Farmingdale, was driving a 2001 Ford Taurus southbound with Ella Gimpel, 88, of East Meadow, as his passenger when the car veered off the roadway and struck a utility pole, police said.
Frobart was pronounced dead at the scene. Gimpel, who suffered critical injuries, was transported by Nassau County medics to a nearby hospital, where she later died.
The investigation into the crash remains ongoing, according to authorities.
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