A motorcyclist was killed and a Good Samaritan injured in an incident involving multiple accidents Sunday night in Freeport, police said.

None of those involved have had their identities released by police. Nassau County police said the incident occurred at the intersection of Mill Road and Merrick Road at 11:04 p.m.

The motorcyclist, identified only as a 52-year-old woman, sustained what police described as "multiple trauma injuries" -- and was pronounced dead by a staff physician at a local hospital at 1:55 a.m.

Police said the victim was headed east on Mill Road, which connects with Merrick Road just west of Meadowbrook Parkway, when she apparently collided with the median and was ejected from her Harley-Davidson.

She was then thrown into roadway on westbound Merrick Road, police said.

A passing motorist who witnessed the crash then stopped at the scene to help her, police said. But police said another driver, identified only as a woman, then struck both the Good Samaritan and the motorcyclist.

It was not clear if the initial crash -- or, the subsequent accident -- caused the fatal injuries to the motorcyclist. Police said the Good Samaritan suffered "non-life-threatening injuries" to his neck and head as a result of being struck.

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A brake and safety check was administered to the vehicle that struck the two, police said. The motorcycle was impounded. No charges were filed.

Police said the investigation into the incident is ongoing.