She is orphaned after her father is killed by Victor Vance and her mother dies from wounds caused by Armando Mendez. Whilst dying, Louise asks Vic to make sure Mary-Jo takes care of her, so it is assumed that she becomes Mary-Beth's legal guardian.
Prominent Appearances in Missions
- GTA Vice City Stories
- Mary-Beth Williams is the youngest character to be featured in the Grand Theft Auto series, as well as being one of the only two minors whose ages appear clearly and have appearances in the franchise, the other one being Jill Von Crastenburg from Grand Theft Auto IV.