The Spokesman-Review reports the property includes some near Watford City in northwestern North Dakota.
Thirty-four-year-old James Henrikson is jailed in North Dakota on a federal firearms charge. Court documents indicate he's also under investigation for allegedly defrauding a company owned by Three Affiliated Tribes Chairman Tex Hall.
The public defender's office says Henrikson is presumed innocent.
Court documents show Henrikson had business dealings in the North Dakota oil patch with Doug Carlile, who was shot by an intruder Dec. 15 at his Spokane home. Henrikson has not been charged in the slaying. Another man is charged with murder.