Pinter, who was awarded the Nobel Prize for literature in 2005, died Wednesday, his wife, Lady Antonia Fraser, told the Associated Press in London. He had been in failing health in recent years, battling cancer of the esophagus as well as pemphigus, a rare autoimmune disease.
His illness left him unable to travel from his home in London to Stockholm in December 2005 for the Nobel presentation. He sent a videotaped speech that was included in the ceremony. His publisher, Stephen Page of Faber & Faber, accepted the prize on Pinter's behalf.
"Pinter restored theater to its basic elements: an enclosed space and unpredictable dialogue where people are at the mercy of each other and pretense crumbles," the Swedish Academy said in announcing that Pinter had been awarded the prize.
"It never occurred to me that I was a contender," Pinter told the Guardian of London in 2005. "I am very grateful."
His Nobel lecture, which he videotaped in England to be screened at the ceremonies, was a scalding critique of U.S. and British policies in Iraq. Pinter was an outspoken pacifist throughout his adult life.
Pinter referred to the invasion of Iraq by U.S. and British forces as "an act of blatant state terrorism, demonstrating absolute contempt for the concept of international law."
He went on to propose a speech he wrote that the U.S. president could deliver. It sounded like a rant from one of his gangster thug characters. It ends abruptly: "You see this fist? This is my moral authority. And don't you forget it."
Menace and brutality in daily life -- between spouses, parents and children, and neighbors -- run through Pinter's plays like an electric current. Dialogue can be elliptical and unspecific, but it is often combative at the same time.
"Pinter was without question the most influential English playwright of the postwar," New Yorker magazine critic John Lahr told The Times in 2005. "He streamlined the nature of the stage and changed the way we hear language."
Although Pinter is best known as a playwright, he was trained as an actor and performed in plays, movies and teleplays throughout his career. Along with about 30 plays, he wrote more than 20 screenplays, including adaptations of a number of his own works, such as "The Caretaker" (1963) and "Betrayal" (1983). He wrote other screenplays, among them "The French Lieutenant's Woman" (1981), from the novel by John Fowles, and "The Last Tycoon" (1976), based on F. Scott Fitzgerald's unfinished novel.
Pinter's most famous plays -- "The Birthday Party," "The Caretaker" and "The Homecoming" -- move on spare dialogue that characters use like weapons against one another.
Piercing language, significant pauses and an undercurrent of violence create an effect that was uniquely his when he introduced it. Critics termed it "Pinteresque."
"The essence of Pinter's singular appeal is that you sit down to every play he writes in certain expectation of the unexpected," playwright David Hare said in 2005. "You never know what the hell's coming next."
Early in his career Pinter was compared to Samuel Beckett, the Irish playwright, for the psychic distress of his characters, their vaudeville-like brutishness and the disjointed dialogue that conveys their despair.
The London premiere in 1960 of "The Caretaker," Pinter's sixth work, launched him as one of the most powerful voices in contemporary theater. In it Aston, a mild-mannered handyman, rescues Davies, a homeless tramp, and allows him to stay with him in the derelict house where he lives.
The play explores Pinter's recurring themes -- an isolated character, an unexpected "intruder," a power struggle that threatens to turn violent. Words are a negotiating tool, a weapon or a coverup. At times the audience is not certain what to think or whom to believe.
"What adds piquancy . . . is that each character can see through the other's pretensions while still clinging desperately to his own," British critic Michael Billington wrote in his 1996 book "The Life and Work of Harold Pinter."
Theater audiences in London gave "The Caretaker" standing ovations. The play ran for a year, and a film version followed with Robert Shaw as Aston, Donald Pleasence as Davies and Alan Bates as Aston's brother Mick.