Cummings, 22, was killed outside of 79 South Terrace Ave., between South Avenue and Davies Avenue, police said.
The suspect may have been driving a dark-colored SUV, such as a Honda Pilot, police said.
Police Chief Doug Solomon said the department is working jointly with Crime Stoppers in offering the reward.
Anyone with information is asked to call the New York State Crime Stoppers hotline at 1-866-313-TIPS (8477). Callers remain anonymous; caller ID is not used on Crime Stoppers hotline phones.
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