Matheson played businessman Mark Wilson -one of the stranded “little people”- on the Irwin Allen series, which aired for two seasons from 1968 until 1970.
The Hollywood Reporter notes he died in his sleep after having been diagnosed with lung cancer 10 months ago.
Land of the Giants was set in the year 1983, as a fantasy series revolving around the crew and passengers of the spaceship Spindrift, which on the way to London crashed on a planet whose humanoid inhabitants dwarfed by giant humans, pets and insects. John Williams was the series composer.
A former cop, Matheson and co-star Gary Conway did many of their own stunts, such as being dropped into specimen jars or climbing ropes, filmed from cranes above, while images of the “giants” were captured from the floor with hand-held cameras.
Matheson’s other credits included Voyage to the Bottom of the Sea, Lost in Space, General Hospital, McHale’s Navy, Death Valley Days, Emergency! The Waltons, Eight Is Enough, Dynasty, Falcon Crest, Santa Barbara, Hill Street Blues, Murder She Wrote and 7th Heaven.
Matheson wed another star on Giants, Deanna Lund (“Valerie Scott’), but their marriage ended in divorce.