David Durk, a New York police detective who with Officer Frank Serpico shattered the infamous blue wall of silence to expose widespread corruption in the city’s Police Department in the 1960s and ’70s, died on Tuesday at his home in Putnam County, N.Y. He was 77.

The cause was cardiac arrest, his wife, Arlene, said. He had been treated for mesothelioma for the past two years, she said.
An Amherst College graduate who studied law at Columbia University, Mr. Durk joined the Police Department in 1963. He imagined a life of public service, as he put it rosily years later, to help “an old lady walk the streets safely” and “a storekeeper make a living without keeping a shotgun under his cash register.”
But what he found was a culture of corruption: of officers and superiors taking payoffs from gamblers, drug dealers, merchants and mobsters for protection and information, like the names of informers they wanted to kill; of officers stealing and dealing drugs, riding shotgun for pushers and intimidating witnesses.