John Cazale: Cause of Death, Meryl Streep & Legacy

There’s something almost mythical about John Cazale’s filmography: just five feature films, and every single one was nominated for the Best Picture Oscar. His face—often weary, always vulnerable—became the emotional anchor of classics like The Godfather and Dog Day Afternoon, but his life was cut short by lung cancer at age 42, leaving behind a legacy tied to his artistry and his love story with Meryl Streep.

Born: August 12, 1935, Boston, Massachusetts ·
Died: March 12, 1978 (age 42), New York City ·
Cause of death: Lung cancer ·
Partner: Meryl Streep (1976–1978) ·
Notable for: Five films, all nominated for Best Picture Oscar ·
Known for roles: Fredo Corleone (The Godfather), Sal (Dog Day Afternoon)

Seven key facts, one pattern: John Cazale’s life was brief but his filmography perfect—every role, every film, carried weight.

Below is a summary of his personal details.

What was the cause of John Cazale’s death?

Lung cancer diagnosis and timeline

John Cazale died of lung cancer on March 12, 1978, at the age of 42 (IMDb). He had been diagnosed with terminal lung cancer in May 1977, while he was in the midst of filming The Deer Hunter (Looper). Director Michael Cimino adjusted the shooting schedule to film Cazale’s scenes first because of his declining health (MovieWeb).

Smoking habits and health decline

Cazale was a heavy smoker, a habit that likely contributed to his lung cancer (The Brooklyn Rail). Biographical accounts describe him as a chain-smoker (MovieWeb). The cancer spread rapidly, and by early 1978 he was in critical condition.

The implication: Cazale’s addiction to smoking cut short a career that had barely begun to peak. He was 41 when diagnosed—still young enough to have decades of work ahead.

The pattern: Cazale’s early death robbed cinema of a uniquely talented actor whose finest work may still have been ahead.

Was Meryl Streep with John Cazale when he died?

Meryl Streep’s presence at his bedside

Meryl Streep was with John Cazale when he died at a hospital in New York City on March 12, 1978 (IMDb). She had been at his side throughout his illness, caring for him as the cancer progressed (Wikipedia). Their relationship had lasted about two years, from 1976 until his death.

Their relationship timeline (1976–1978)

Cazale and Streep met in 1976 while performing in a Central Park production of Shakespeare’s Measure for Measure produced by the New York Public Theater (IMDb). They soon began a romance and moved in together (Wikipedia). Streep supported Cazale through his cancer treatment, often commuting between the hospital and the set of The Deer Hunter.

The pattern: Their partnership, though short, demonstrated a depth of commitment that would define Streep’s later reflections on love and loss.

Did Meryl Streep ever get over John Cazale?

Streep’s public statements about Cazale

Meryl Streep has spoken publicly about her grief over Cazale’s death, calling him “the love of my life” in several interviews (Wikipedia). In a 2015 interview with The Daily Mail, she said, “I’ll never forget him. He was the most wonderful person I ever met” (IMDb).

Her marriage to Don Gummer

Six months after Cazale’s death, Streep married sculptor Don Gummer in September 1978 (Wikipedia). She had four children with Gummer and remained married to him for over 45 years. Yet in interviews she has acknowledged that Cazale left a lasting, irreplaceable mark on her life.

The pattern: Streep built a full family and career after Cazale, but her words suggest that the love she had for him never faded—it simply transformed.

Was John Cazale a heavy smoker?

Smoking as a known risk factor

John Cazale was a heavy smoker, a fact confirmed by multiple biographical sources (MovieWeb). His chain-smoking habit was well-known among his colleagues and contributed directly to his lung cancer diagnosis (The Brooklyn Rail).

Accounts from colleagues about his habit

Co-stars and directors often recalled Cazale smoking incessantly between takes. According to Looper, his smoking was “legendary” on set. The habit was so entrenched that even after his diagnosis, he reportedly found it difficult to quit.

The implication: Cazale’s addiction to smoking remains the central preventable factor in his early death. For fans, his body of work serves as a bittersweet reminder of what was lost, and you can learn more about Shannen Doherty’s life and legacy at Shannen Doherty’s life and legacy.

For film lovers and students of acting, John Cazale’s career remains a masterclass in quality over quantity. His five films, each a Best Picture nominee, set a standard that may never be matched. For Meryl Streep, the man she lost in 1978 left a mark that shaped her art and her life—a reminder that even the briefest partnerships can echo for decades. Streep’s later work in projects like Scenes from a Marriage shows how she channeled personal loss into towering performances. Other actor biographies confirm the same truth: John Cazale’s legacy proves that a brief career can leave an indelible mark.