What caused the death of john greenleaf whittier?

John Greenleaf Whittier died of complications related to pneumonia on September 7, 1892. He was 85 years old at the time of his death. Whittier, a prominent American poet and abolitionist, had spent his later years in failing health but remained active in writing until shortly before his passing. His contributions to American literature and social causes continue to be celebrated.