There have long been doubts about whether the remains in a private crypt are really those of Col. Francisco Alberto Caamano Deno, who was killed by government troops in 1973.
Family members said Wednesday that they are hoping a DNA test will resolve lingering doubts.
Caamano belonged to a faction seeking to restore President Juan Bosch, who was seen as an ally of communist Cuba and ousted in a U.S.-backed coup. He briefly led the country until a U.S. invasion in April 1965, bringing on a civil war.
Dominicans embraced Bosch and Caamano as heroes after years of dictatorship.