Peter Cullen, the distinctive voice behind Optimus Prime in the Transformers franchise and Eeyore in The New Adventures of Winnie the Pooh, died on September 2, 2026, at the age of 85. His passing was attributed to cardiac arrest, with respiratory arrest also noted as a factor. A malignant neoplasm of the lower lobe of the lungs was listed as an underlying cause, according to his death certificate.
Cullen's career spanned decades, beginning with his birth in Montreal in 1941. After initial aspirations of becoming a dramatic actor, he found his niche in voice work, honing his talent for accents and characters. His early work included roles on shows like Scooby-Doo & Scrappy-Doo and Alvin and the Chipmunks. He also provided the voice for the melancholic donkey Eeyore, a role he embraced from 1988 to 1991 and reprised in various Winnie the Pooh projects.
His breakout role came in 1984 when he was cast as Optimus Prime in the original animated series, The Transformers. The character's voice, imbued with compassion, strength, and dignity, was famously inspired by his brother Larry, a Marine Corps captain who served in Vietnam. Cullen described his brother's guidance as shaping Optimus Prime's persona: "Be compassionate, be strong enough to be gentle, and have a little dignity. But be strong."
The success of The Transformers launched a multi-billion-dollar franchise. Cullen reprised his role as Optimus Prime in the live-action film series, beginning with the 2007 release directed by Michael Bay. He voiced the iconic robot in subsequent films, including the most recent 2023 release, Transformers: Rise of the Beasts. Two of the Bay-directed films, Dark of the Moon (2011) and Age of Extinction (2014), each grossed over $1 billion worldwide.
Cullen's family confirmed his peaceful passing at his Los Angeles home, surrounded by loved ones. A statement from his representative encouraged those who knew him to honor his legacy by serving their communities with compassion, integrity, and loyalty, and to "be strong enough to be gentle."