His role on Bewitched (1964) was first offered to him in 1964, but he was under
a contract with Universal Studios, so Dick York was hired instead. By the
time an illness caused York to discontinue the role, Sargent was free
enough to take over.
His father, Elmer Cox, was a World War I hero and a Hollywood business
manager. His mother, Ruth McNaughton, was a film actress.
Sargent and fellow Darrin-portrayer, Dick York, were once the subject of a "Jeopardy!" category called "Sargent/York", focusing on their non-Bewitched (1964) roles.
Lived in Mexico and ran and import/export business in his early years.
His love for Mexican art and culture stayed with him for the rest of
his life.
He was never married, but had a long-time companion whom he was with
for 20 years before the man's death from a cerebral hemorrhage in 1979.
He had "manufactured" a wife to the press in the early productive days,
to protect his career.
His grandfather, John McNaughton, founded Los Angeles's Union
Stockyards.