Events of L.A. Noire
The group is encountered during the side-mission Amateur Hour, in which they attempt to rob a jewelry store, but are interrupted by Cole Phelps and Stefan Bekowsky. While Audrey surrenders immediately, Walker and the rest of the gang flee into the store.
Phelps must go in after them and kill Higgins, then go upstairs and kill Walker and the unnamed criminal. However, Audrey knocks Bekowsky down and attempts to flee in a vehicle, but crashes it and is arrested.