Martha Wayne was the mother of Bruce Wayne and wife of Thomas Wayne. She was a noted philanthropist among Gotham's elite.
One night, while walking through an alley to catch a cab, Martha and her family were mugged by an armed robber. After taking Martha's pearl necklace, the robber deliberately murdered Martha, only seconds after he did the same to her husband Thomas.
Selina Kyle, picking up a photograph in Wayne Manor, observed to Bruce that "she looks nice", which gave him an opening to berate himself once more for his inaction.