Harry Jackson became MacGyver’s grandfather after his paternal grandmother and biological father died in a car crash. After 18 years of estrangement, he appeared in the 10th episode of Season 1, called “Target MacGyver.” In the 5th season episode, “Passages”, Harry dies of a heart attack.
John Anderson had a a long and distinguished career as an actor before playing Mac’s grandfather on “MacGyver.” Over 6 meters tall with a thin skeleton, he bears a striking resemblance to President Abraham Lincoln, whom he has portraited three times during his career. He appeared in classic TV shows like “The Incredible Hulk,” “The Rockford Files,” and “Dallas,” along with feature films like Alfred Hitchcock’s “Psycho.” He’s one of many who appeared in both “MacGyver” and one of many “Star Trek” Franchising.
Just like Anderson’s character, Harry, succumbs to a heart attack in the film, the actor suffered a fatal heart attack at his home at the age of 69 in 1992, just months after the series movie ends. New York Times.
https://www.looper.com/721487/macgyver-actors-you-may-not-know-passed-away/ Actor MacGyver you may not know has passed