The incident was reported Sunday night just before 9 p.m. on Route 17.
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Authorities say the two brothers were riding the lawnmower when they attempted to cross the street into traffic and were struck by a vehicle.
The brothers were taken to Hackensack Medical Center in critical condition.
One of the brothers, 29-year-old Richard Mackey, died from his injuries Monday morning.
His brother, also 29, remains in the hospital with serious injuries.
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The 49-year-old driver of the other vehicle remained on the scene and is cooperating with investigators.
The incident remains under investigation.
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