Scottish actor known for roles in 'The Man From U.N.C.L.E.' and 'NCIS,' David McCallum, has passed away at the age of 90.

McCallum was famous for his portrayal of the enigmatic Russian-born U.S. secret agent Illya Kuryakin in 'The Man From U.N.C.L.E.'

[{"selector":"#anim-be62be0d-f0b8-4740-bd77-91fb02901305 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] News

He also played the role of chief medical examiner Donald "Ducky" Mallard on the hit TV series 'NCIS.'

[{"selector":"#anim-98cb5fdd-eff3-4d7e-abd9-9cd691fe2cb4 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] News

McCallum passed away due to natural causes while surrounded by his family at NewYork-Presbyterian Hospital.

[{"selector":"#anim-92f97f26-3831-4d70-afcc-7571250abc9e [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] News

In addition to his American TV roles, McCallum starred alongside Joanna Lumley in the British sci-fi series 'Sapphire & Steel' and appeared in the BBC drama 'Colditz.'

[{"selector":"#anim-2bd24c47-bf3f-40fa-b646-f887e569653e [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] News

'Sapphire & Steel' is considered a precursor to 'The X-Files,' and McCallum's role alongside Lumley garnered attention.

[{"selector":"#anim-33cb4721-ed7d-4443-8b0e-9b193f65d30e [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] News

McCallum was previously married to British actress Jill Ireland and later married model Katherine Carpenter, with whom he spent 56 years.

[{"selector":"#anim-2d1c10ff-4998-4efa-84f9-815023e87ef4 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] News

His first marriage to Jill Ireland ended after a decade when she left him for actor Charles Bronson.

[{"selector":"#anim-704696a9-7c58-4a9d-9fd1-a4f6b045c2a5 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] News

McCallum leaves behind a lasting legacy in the entertainment industry and is remembered for his significant contributions to television.

[{"selector":"#anim-f2e832dc-9d46-4bb9-a452-02864b636fa1 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] News

His passing was confirmed by a CBS spokesperson, and he is survived by his wife, Katherine Carpenter, and family.

[{"selector":"#anim-ed3de7e2-518d-4365-a7e0-598b9a5ac46f [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] News