Like the first sheriff of Modoc County, Oliver D. Weller was a refugee from the War Between the States. He was born in Kentucky and he moved to Lake City. Oliver Weller and his predecessor, Joseph Marks were both civic minded, and theywere involved in helping Lake City be a safe community. He entered into the political life of Modoc County as a deputy sheriff under Sheriff Marks. When Oliver Weller was elected sheriff in 1878, with Mr. Bailey served as his deputy. Sheriff Weller appointed John P. Cannon of Lake City as his undersheriff. Oliver Weller died in 1886 at the age of 67.