If I remember, the son of Errol Flynn (Sean Flynn) disappeared on a trip to Cambodia.
Leftists really underestimated the dangers of the Khmer Rouge; they routinely killed people with glasses (a sign of literacy), anyone carrying money (a sign of class distinction), and anyone who could speak French (an indication that they were the former upper class).
They didn’t play ball like the North Vietnamese with our media...
Just looked it up; he disappeared after a probable encounter with the Viet Cong in Vietnam.