The crash happened at around 9:30 a.m. Monday, Aug. 7, in Ronkonkoma, on Rosevale Avenue, according to Suffolk County Police.
Investigators said 72-year-old Lydia Ciminelli was crossing Rosevale Avenue just south of Motor Parkway when she was struck by a southbound vehicle.
Ciminelli, of Lake Ronkonkoma, was taken by ambulance to Stony Brook University Hospital where she was pronounced dead.
Detectives described the vehicle as a dark colored sedan.
Anyone with information in the case is asked to contact the Suffolk County Police Department at 631-852-6553 or Crime Stoppers at 1-800-220-TIPS.
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