These days, David McCallum is known to the masses as medical examiner "Donald 'Ducky' Mallard" on NCIS. But that, of course, is not his only great role. At the age of 86, he has played a vast amount of movie and TV roles over the course of his long career. One of them was alongside the legendary Charles Bronson in the classic 1963 movie The Great Escape.

David McCallum: Charles Bronson stole his wife

At the time, McCallum was married to fellow actress Jill Ireland. During the filming of The Great Escape, Bronson did in fact start to charm Jill and she eventually left McCallum and even got married to McCallum's co-star in 1968. This was a hard time for McCallum, as he revealed when speaking to The Mirror:

"It was an extremely difficult time, not least because we had three children." But McCallum also said that he never held a grudge against Mr. Bronson.

"I never hated him, Charlie was always a good friend," McCallum went on. "I find that when problems come along, worrying about them and getting anxious and negative is quite unnecessary. You can solve them, usually amicably. That's what happened."

After his split from Jill Ireland, McCallum met Katherine Carpenter, who was working as a fashion model back then. They got married in 1967, the same year that his divorce from Ireland was finalized. The couple have two children - a son named Peter and a daughter named Sophie.

McCallum and his wife are involved with a bunch of charitable organizations that support the Armed Forces, and with good reason: Katherine Carpenter's father fought on Iwo Jima in WWII and her brother died in the Vietnam War.

NCIS star David McCallum: "The worst moment of my life..."

While David McCallum has had, as he says, "an incredible life", there was also some heartache for him and Katherine in the late eighties. In 1989, their adopted son Jason died from a drug overdose at the age of 27 - he was about to become a father. McCallum addresses this period of his life in the interview as well.

"The worst moment of my life was when I lost my son, there's no question of that," he said. "Losing people you love are always the most terrible moments, especially when they're so young."

Today, David McCallum can thoroughly enjoy his life with his large family and the success of NCIS, which is still one of the most-watched network TV shows. "The best moment of my life is right now!" McCallum said.