It happened on Saturday, Feb. 29 just after 1:30 a.m. in Central Islip.
Third Precinct officers on a routine patrol in an unmarked police vehicle observed Jerry McKoy, 54, of Central Islip, striking Elias Ortiz-Campos, 44, of Central Islip, during a robbery in the parking lot of Laundry Palace, located at 18 E. Suffolk Ave., Suffolk County Police said.
The officers intervened and arrested McKoy.
Ortiz-Campos was transported to Southside Hospital in Bay Shore for treatment of non-life-threatening injuries.
McKoy was charged with first-degree robbery and for an outstanding warrant. He was held overnight at the Third Precinct and was scheduled to be arraigned at First District Court in Central Islip Saturday morning.
The investigation is continuing. Anyone with information is asked to contact the Third Squad at 631-854-8352.
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