The accident happened at about 12:30 a.m. just east of exit 53 in Brentwood.
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The officer, Anthony Robitaille of the 75th Precinct, had pulled over to the shoulder in his 2010 Honda to speak to the driver of a BMW, possibly because of a fender-bender.
Both drivers were outside of their vehicles on the shoulder when police say a 2013 Ford sedan, driven by Desirea Coyle, struck the rear of the Honda. The Honda then struck the BMW and Robitaille.
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Robitaille, of Centereach, was transported by Suffolk County Police helicopter to Stony Brook University Hospital for treatment of serious injuries, including a head injury.
Coyle, 33, of Highland Falls, NY, was taken to Southside Hospital in Bay Shore for treatment of minor injuries. A passenger in the BMW sustained minor injuries and declined treatment.
The crash is under investigation and no charges have been filed.
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