Authorities were called to a residence on Elliott Street and Frankel Boulevard in Merrick around 11:45 p.m. Saturday.
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They discovered 32-year-old Evan Grabelsky with multiple stab wounds. He was pronounced dead a short time later.
He lived with his family, investigators said.
Police say it was not a random attack, and that the attacker and victim knew each other.
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There had been an extensive struggle, and the victim had defensive wounds to his hands and arms.
"We are conducting a very complex, intense investigation," Nassau County Police Det. Lt. Richard LeBrun said. "We're checking video, we're interviewing neighbors, we're going into backyards, frontyards, neighbors residences, neighbor's properties."
No information has been released about the suspect, and no weapon was recovered.
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