South Dakota Codified Laws
Chapter 64 - Unauthorized Commercial Use Of Personality's Right Of Publicity
Section 21-64-4 - Termination of personality's right of publicity.

21-64-4. Termination of personality's right of publicity.
A personality's right of publicity terminates if the personality is deceased and there is no living next of kin of the personality and the personality has not assigned his or her rights.

Source: SL 2015, ch 126, ยง4.