A Lynbrook man pleaded guilty Thursday to felony drunken driving -- his 12th drunken driving conviction -- among other charges after hitting a couple in their 70s last year as they crossed Merrick Road in Oceanside, leaving both of them injured, prosecutors said.

Sean Crane's plea came in exchange for a promised sentence of 55/6 years to 14 years, according to District Attorney Kathleen Rice's office.

"This defendant's history of repeated drunk driving offenses is proof that the only way to protect our community from the most dangerous offenders is to put them in prison," Rice said in a statement.

On the evening of May 26, 2012, Crane, 51, was driving his girlfriend's 201 Nissan Juke east on Merrick Road when he struck a 76-year-old Merrick woman who was holding hands with her 78-year-old husband as they walked south across Merrick Road on their way to dinner, prosecutors said.

"Crane swerved into oncoming traffic, but hit the female victim with the passenger-side mirror of his vehicle," Rice's office said in a news release. "The impact broke the female victim's wrist and threw her into her husband. Both victims fell onto the roadway. The female victim also suffered road rash to her legs, while her husband suffered a torn Achilles tendon and needed nine staples to close a wound he suffered when his head hit the roadway."

The driver stopped a short distance away and returned to the scene of the accident on foot. Police arrested Crane, whose blood-alcohol content was .20 percent two hours after the crash, prosecutors said.

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The conviction is Crane's 12th since 1981, "10 of which have been felonies and two of which have resulted in Crane serving time in an upstate prison," prosecutors said. "Six of his 12 convictions have come from Nassau County incidents; the others are from Suffolk County."

Crane pleaded guilty to the entire indictment against him, including felony aggravated DWI, two counts of felony DWI, first-degree unauthorized use of a vehicle, reckless driving and reckless endangerment, among other charges, prosectors said.

Judge Philip Grella is scheduled to sentence him on Dec. 6.