David McCallum, who starred in the 1960s spy series "The Man From U.N.C.L.E." and the CBS crime drama "NCIS," has died at the age of 90.

McCallum was born in Glasgow, Scotland in 1933. He began his acting career in the early 1950s. In 1964, he was cast as Illya Kuryakin in "The Man From U.N.C.L.E."

"The Man From U.N.C.L.E." was a huge success, and McCallum became a popular star. The show ran for four seasons and spawned a feature film

"The Man From U.N.C.L.E." ended, McCallum continued to act in films and television shows. He had notable roles in the films "The Great Escape" (1963), "Billy Budd" (1962), and "Freud" (1962).

In 2003, McCallum joined the cast of the CBS crime drama "NCIS" as Dr. Donald Ducky Mallard. McCallum remained on the show for 19 seasons, making him one of the longest-tenured cast members.

McCallum was nominated for a Golden Globe Award for Best Supporting Actor – Series, Miniseries or Television Film for his work on "NCIS" in 2010. He also received a star on the Hollywood Walk of Fame in 1994.

McCallum was married to actress Jill Ireland from 1957 to 1967. They had three sons together. In 1969, he married Katherine Carpenter. They have two sons together.

David McCallum was also a talented musician and singer. McCallum was a beloved figure in the entertainment industry and will be deeply missed.

David McCallum was a talented actor with a long and successful career. He was best known for his roles in "The Man From U.N.C.L.E." and "NCIS."