Michael Herr, whose reporting during the Vietnam War culminated in the nonfiction novel Dispatches and later became known for his writing in the films Apocalypse Now and Full Metal Jacket, died in upstate New York. He was 76.

Publisher Alfred A Knopf, who released Dispatches in 1977, confirmed Herr’s 23 June death to the Associated Press.

Herr’s work in Dispatches has been heralded by critics as one of the greatest pieces of writing about the savagery of war. The book documents the reporter's time spent covering the Vietnam War for Esquire magazine between 1967 and 1969.

Hunter S Thompson, the late gonzo journalist known for his experiential reportage, lauded the book. “We have all spent 10 years trying to explain what happened to our heads and our lives in the decade we finally survived,” Thompson wrote of the work, “but Michael Herr’s Dispatches puts all the rest of us in the shade.”

Spy novelist John le Carré said the work was “the best book I have ever read on men and war in our time.”

Herr obsessed over the book during the 18-month writing process, which triggered an emotional breakdown, he revealed in an interview with The Observer.

The Vietnam War 40 years on Show all 10 1 /10 The Vietnam War 40 years on The Vietnam War 40 years on The Vietnam War A helicopter lifts off from the US embassy in Saigon, Vietnam during last minute evacuation of authorized personnel and civilians on 29 April 1975 The Vietnam War 40 years on The Vietnam War A cargo net lifts refugees from a barge onto the SS Pioneer Contender for evacuation from the fallen city of Da Nang, Vietnam on 1 April 1975 The Vietnam War 40 years on The Vietnam War Captain Donald R Brown crouches on the ground in Saigon, waiting for the order for attack across an open field against Vietcong positions 5 April 5 1965 The Vietnam War 40 years on The Vietnam War Orphans aboard the first 'Operation Babylift' flight at the end of the Vietnam War look through the windows of World Airways DC-8 jet as it flies them to the United States in April 1975 The Vietnam War 40 years on The Vietnam War Young demonstrators toss sticks and rocks at South Vietnamese riot police in Saigon in a brief confrontation after a rally sponsored by the mainly Catholic anti-corruption movement on 4 April 1975 The Vietnam War 40 years on The Vietnam War US Navy personnel aboard the USS Blue Ridge push a helicopter into the sea off the coast of Vietnam in order to make room for more evacuation flights from Saigon in 29 April 1975 The Vietnam War 40 years on The Vietnam War South Vietnamese troops and western TV newsmen run for cover as a North Vietnamese mortar round explodes on Newport Bridge on the outskirts of Saigon in 28 April 1975 Hoanh/AP The Vietnam War 40 years on The Vietnam War US sailors transfer a South Vietnamese boy from the USS Blue Ridge to a merchant vessel off the South Vietnam coast during evacuations from South Vietnam in 1 May 1975 The Vietnam War 40 years on The Vietnam War A North Vietnamese tank rolls through the gates of the Presidential Palace in Saigon, signifying the fall of South Vietnam. The war ended on April 30, 1975, with the fall of Saigon, now known as Ho Chi Minh City The Vietnam War 40 years on The Vietnam War A US Marine, who was wounded in the head as he fought against the Viet Cong from inside an amphibious tank, is led to evacuation helicopter landing zone at Van Tuong, Vietnam on 19 August 1965

“The problem with Vietnam is that if your body came back, your mind came back too,” he recalled in the 2000 interview. “Within 18 months of coming back, I was on the edge of a major breakdown.

“It hit in 1971 and it was very serious. Real despair for three or four years; deep paralysis. I split up with my wife for a year. I didn't see anybody because I didn't want anybody to see me.”

Herr revisited the Vietnam War in the almost hallucinogenic narration in Francis Ford Coppola’s epic 1979 film Apocalypse Now. He co-scripted Stanley Kubrick’s 1987 film Full Metal Jacket, for which he received an Oscar nomination for Best Adapted Screenplay.

Former reporter discusses media s role in Vietnam war

Herr was born in Lexington, Kentucky, on 13 April 1940, and later grew up in Syracuse, New York. He attended Syracuse University, but ultimately dropped out in favour of wayward life of travel - akin to writers like Ernest Hemingway.

A private man, Herr told Los Angeles Times that the resounding success of Dispatches “blew [his] cover”, as reporters and television producers consistently attempted to get him to relive the harrowing details of the Vietnam War.

He fled to London after the book’s release, but finally returned to the States in 1990.

“The reception couldn't have been better, frankly – it couldn't have been more wonderful,” he said. “It totally changed my life. But it also blew my cover. It was great for a little while, but then I wanted to stop it, and you can't turn that tap off so easily, particularly in New York.”

He recalled turning down a lucrative offer to host a documentary commemorating the 10th anniversary of the end of the Vietnam War.

“I said I would rather observe this great anniversary in private,” Herr said. “The idea of going on television just fills me with dread and horror. But to go on and impersonate an old war correspondent returning seems really profane. Really profane.

“If they want to commemorate the Vietnam War, man, they can welcome the veterans home. Set up some apparatus to take the pain away.”