The stabbing happened on Oakwood Road in West Hills across the street from a middle school.
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Suffolk County Police say the suspect, 53-year-old Candelario Cordova, was driving a 2000 Jeep Grand Cherokee with 58-year-old Roque Cisneros, when he pulled over on Oakwood Road, grabbed a knife from his trunk and began stabbing Cisneros.
Cisneros' wife, 54-year-old Vilma Campos, pulled up and Cordova then stabbed Campos.
Witnesses called police and officers responded and took Cordova into custody.
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Cisneros was pronounced dead at the scene. Campos was taken to Huntington Hospital with non-life-threatening injuries.
Cordova was charged with second degree murder. Further charges are pending.
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He is scheduled to be arraigned in court on Friday.
There's no word yet on what led up to the stabbing or whether the suspect and victims knew each other.
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