No arrests have been made in the slaying of a well-known Long Island horseman, Suffolk police said Sunday.

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Ross Reisner, 50, was fatally shot in his Setauket home Sept. 24 about 8:45 p.m.

The shooter or shooters fired multiple shots through a first-floor window, striking Reisner in the chest, police said. Reisner's domestic partner, Kevin Murray, was grazed in the arm, but refused medical attention.