Crypt of Dark Secrets (1976)

Army Ranger Ted Watkins, returning from his last tour of duty in Vietnam, decides to abandon society and take up residence in a remote corner of the Louisiana swamps. Thinking Watkins has a stash of loot hidden away in his cabin, three thieves sneak into his cabin and murder the man in cold blood. Before they can get away, however, a swamp witch named Damballa performs a voodoo rite to bring Watkins' body back to life and take revenge on the men who killed him.