Who killed Mary shaw?

Please provide more context! "Mary Shaw" could refer to several different people, and without more information, it's impossible to know who you're asking about.

To help me answer your question, could you please tell me:

* Is this a real person or a fictional character?

* If fictional, what book, movie, or TV show are you referring to?

* Do you have any more details about Mary Shaw, such as her profession or where she lived?

The more information you give me, the better I can assist you.