Peter Cullen, the iconic voice of Optimus Prime in “Transformers,” died from cardiac arrest, with lung cancer listed as the underlying cause, according to his death certificate.
Cullen died at his Los Angeles home on August 26 at the age of 85.
The death certificate lists the immediate cause as cardiac arrest due to respiratory arrest. It also identifies a malignant neoplasm in the lower lobe of the lungs as the underlying cause.
The records also list several other significant conditions, including cerebellar metastasis, hypoxia, chronic obstructive pulmonary disease, hypertension and hyperlipidemia.
His family had announced his death without initially revealing the cause, saying he died peacefully surrounded by loved ones.
Cullen became synonymous with Optimus Prime after first voicing the Autobot leader in the original “Transformers” animated series in 1984.
He continued playing the character for decades, including in Michael Bay’s live-action “Transformers” movies and the 2023 film “Transformers: Rise of the Beasts.”
Beyond Optimus Prime, Cullen also gave his distinctive voice to Eeyore in the “Winnie the Pooh” franchise.
His funeral is scheduled for September 9 at Forest Lawn in Los Angeles.