Early retirement and his Annuity??

Hola! If my ex Army buddy gets 100% disability at a young age, what happens to his (we think its a target 2040 fund) that has a good amount of money in it. If he dosent contribute to it anymore what happens to it? Does it still grow? He does not plan on working again so there is no place to “roll it over” to. Anyway. 2 dummy trying to plan his retirement! Thanks guys!!