A Brooklyn man's honeymoon on the North Fork came to a tragic end Wednesday when his car veered into oncoming traffic and crashed head-on into a bus.

Jeremiah Grünblatt, 42, was pronounced dead at the scene of the Greenport crash -- a Long Island Rail Road bridge on Main Road, Route 25, near Sage Boulevard, police said.

His wife of three days, Keturah Grünblatt, 39, a passenger in the compact station wagon, was treated for non-life-threatening injuries, Southold Police Chief Martin Flatley said.

The couple were wed Sunday at Grand Ferry Park in the Williamsburg section of Brooklyn, according to their wedding website. During their honeymoon, they lazed on the beach at Southold, dined with a view of Long Island Sound and gazed at the moon from Shelter Island, Keturah Grünblatt posted on Instagram.

"Post beach cocktails on our back porch. Honeymoon," read a post Tuesday from the Silver Sands Motel in Greenport.

Police said a Suffolk County Transit bus was traveling east shortly before noon on Route 25, on the Southold border, when the westbound car "swerved into the path of the bus, striking it head-on."

The bus driver -- Luis Garnica, 50, of Hampton Bays -- suffered a serious leg injury, Flatley said.

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Christa Brown, president of Sunrise Coach Lines in Greenport, which contracts with the transit system and operates the bus, described Garnica as a "wonderful driver, a wonderful man."

Brown said Garnica slammed on the brakes and tried to avoid being hit by the car on the two-lane bridge. The impact crushed the driver's side of the car and punched a hole in the left front end of the bus.

Brown said an EMT with the Southold Fire Department responded to the scene and applied a tourniquet to Garnica's leg. One of the five passengers on the bus was treated for minor injuries, police said.

The crash remains under investigation, and police could not immediately say what caused the car to veer into traffic.

A relative of the Grünblatts declined to comment Wednesday night. Other family members did not return calls.

The couple met through "the magic" of the Internet in 2011, after Keturah, who directs and choreographs operas, moved to New York City from San Diego, according to their website.

Jeremiah Grünblatt, skilled at artistic woodwork, carved a wedding ring box for his bride out of a special block of wood his father had given him when Jeremiah was 5, his Facebook posting said.

He put the ring in the box and added diamonds from his grandmother's brooch and a piece of his mother's childhood necklace.

"And then I asked Keturah Stickann to marry me. And she said yes," he posted in August 2014.

Grünblatt, raised in Brooklyn, was a 1994 Brown University graduate who worked as a carpenter and set designer for Off-Broadway shows and university theater, said Andrew Case, a longtime friend.

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At 10:39 p.m. on Saturday, Keturah excitedly tweeted a line from "My Fair Lady."

" 'I'm getting married in the morning . . . !' No seriously. I'm getting married in the morning. In the morning!!"

With Randee Daddona

and John Valenti