All Class D members of the South Dakota Retirement System as of July 1, 2020, are considered vested. No contributions by Class D members are required on or after January 1, 1990. A participant, whether active or inactive, shall cease to be a participant on the earlier of the following:

1. (1) The date of the participant's death; or
2. (2) The date the participant receives a single sum distribution in lieu of all of the benefits under the plan.

An inactive participant shall also cease to be a participant on the earliest date on which the participant is not entitled to a deferred monthly income.

Source: SL 2020, ch 13 , § 17.