Peacock was born in Sydney in 1951 and began his journalism career with The Sydney Morning Herald. He joined the ABC in 1979 and quickly became one of the broadcaster's most prominent journalists.
Peacock's work was often controversial, but he was always unafraid to speak his mind. He was a strong advocate for the public's right to know and was not afraid to challenge those in power. He will be sadly missed by all who knew him.
In a statement, the ABC said: "Matt Peacock was a giant of Australian journalism. He was a brilliant reporter, a gifted writer, and a passionate advocate for the public's right to know. He will be deeply missed by all who knew him."
Peacock is survived by his wife, Jenny, and two children.