Composer Shirley Walker, best known for her television work on "Batman: The Animated Series", has died of a brain aneurysm at the age of 61.

Sources:
http://www.soundtrack.net/news/article/?id=872
http://www.musicfromthemovies.com/article.asp?ID=790

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Shirley Wlaker actually handled most of the musical compositions on almost all of the DCAU series, including BTAS, TNBA, STAS and Batman Beyond. Her work will always be remembered.

Gold

so sad..

but surely she will not be forgotten

God bless her soul...

Her final work before she passed on was (again) on Bruce Timm's upcoming DTV - DC New Forntier.