According to CBS St. Louis, the woman fell from the second story and died after being taken to the hospital.
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The team's chairman, Tom Stillman, released a statement on the Blues' website on Friday:
The entire St. Louis blues organization is deeply saddened today. Following last night's home game, a fan riding an escalator in the arena was involved in a fall. Tragically, she died as a result of injuries sustained in the fall. We are working closely with the St. Louis Police Department to investigate the facts surrounding this tragic event.
Everyone with the St. Louis Blues -- our ownership, management, coaches, players, and staff -- extends our deepest and heartfelt sympathies to the woman's family and friends. We will keep them in our thoughts and prayers, and we ask all Blues fans to do the same.
-- Alex Suskind