Mississippi Code Title 63. Motor Vehicles and Traffic Regulations § 63-21-253

(1) An owner of a motor vehicle may transfer the owner's interest in the motor vehicle to a sole beneficiary effective on the owner's death by designating a beneficiary as provided by Section 63-21-261.

(2) A beneficiary designation is:

(3) A will may not revoke or supersede a beneficiary designation, regardless of when the will is made.

(4) A designated beneficiary may disclaim the designated beneficiary's interest in the motor vehicle as provided by applicable law.