David Keith McCallum was a Scottish actor and musician who lived from 19 September 1933 to 25 September 23. In the 1960s, he became well-known for his role as secret agent Illya Kuryakin in the hit TV series The Man from U.N.C.L.E.

He also played the characters Carter in Colditz (1972–1974) and Steel in Sapphire & Steel (1979–1982) on television. McCallum’s portrayal of NCIS medical examiner Dr. Donald “Ducky” Mallard in the American television series NCIS helped him regain international fame starting in 2003.

McCallum made a notable movie appearance in The Great Escape (1963).

Were David McCallum and Mark Harmon friends?

There are no available records confirming whether David McCallum and Mark Harmon were friends however, they were co-stars in NCIS. Mark Harmon paid his tribute to David when he heard of his passing.

The team’s chief medical examiner and one of the show’s most well-known characters, Dr. Donald “Ducky” Mallard, is played by McCallum in the CBS television series NCIS, which debuted in 2003.

What did Ducky look like as a child? is a question Special Agent Caitlin Todd of NCIS (Sasha Alexander) puts to Special Agent Leroy Jethro Gibbs (Mark Harmon) in Season 2 Episode 13 of “The Meat Puzzle.” Gibbs then responds, “Illya Kuryakin”