A family member found John Chakalos dead in his home Friday, police said in a statement.
Police said they are conducting a homicide investigation because a weapon was not recovered at the scene, and due to the the way the victim's body was positioned.
Chakalos and his late wife, Rita, who died in November, were known for their grand display at a home they owned in New Hampshire.
The display took up half of their 86-acre plot, caretaker Joy Washburn said.
The couple took donations for a local food pantry and allowed the public to drive through the estate and view the display, which included a life-size village, a 22-foot Santa and a Nativity scene.
"There isn't now in the woods a bush or a tree that doesn't get lights on it," Washburn said.