The United States Coast Guard said on Sunday that it had suspended its search for the remaining two people missing in the crash of a small plane off Long Island that was carrying the prominent builder, Ben Krupinski, his wife, Bonnie, their grandson and the pilot.

Mr. Krupinski, whose clients included Billy Joel and Martha Stewart, was once described in an article in The New York Times as a “contractor to the stars,” a quote that his firm, Ben Krupinski Builder, emblazoned on its website.

The police identified the grandson as William Maerov, 22, of East Hampton, and the pilot as Jon Dollard, 47, of Hampton Bays. The bodies of two of the passengers were recovered on Saturday.

The East Hampton Police Department said on Saturday that the airplane, a Piper PA31 Navajo, had been expected to land at the East Hampton Airport. Soon after the plane crashed at about 2:50 p.m., the police department said, a debris field was located approximately 1.5 miles south of Indian Wells Beach in Amagansett.