The New York Times reported citing Brown's daughter that he had died from pancreatic cancer at his home in Rancho Santa Fe, California.
Brown was a nuclear physicist who led US efforts to modernise its defence system with weapons that included cruise missiles, stealth aircraft, and other weapons programmes.
— Jerry Hendrix (@JerryHendrixII) 6 января 2019 г.
— Tᴏm Mᴏᴏʀᴇ (@PaperMissiles) 6 января 2019 г.
In the 1970s, Brown had been a delegate to the Strategic Arms Limitation Talks involving the United States and the Soviet Union.