Just to add to the answers you already got, here are a few real examples linked by [this ngram](https://books.google.com/ngrams/graph?content=his+murder&year_start=1800&year_end=2000&corpus=15&smoothing=3&share=&direct_url=t1%3B%2Chis%20murder%3B%2Cc0#t1%3B%2Chis%20murder%3B%2Cc1).

**Being the victim**

-  "Now the hour had come, and an unstoppable chain of events had begun that would end in His murder." [(The murder of Jesus)](http://books.google.com/books?id=4z-cm4eJYWoC&pg=PT8&dq=%22his+murder%22&hl=en&sa=X&ei=751GU-2GA8LPhAfD8oG4Cg&ved=0CEoQ6AEwBQ)

- "It was only after his murder that I gradually learned about the circumstances surrounding his death." [(Human Rights in Northern Ireland)](http://books.google.com/books?id=2GBQRoB4JDYC&pg=PA49&dq=%22his+murder%22&hl=en&sa=X&ei=751GU-2GA8LPhAfD8oG4Cg&ved=0CFAQ6AEwBg)

- "One [gal](http://www.oxforddictionaries.com/definition/english/gal) gets life for his murder" [(Magazine Weekly World News)](http://books.google.co.uk/books?id=ZfQDAAAAMBAJ&pg=PA29&dq=%22his+murder%22&hl=en&sa=X&ei=751GU-2GA8LPhAfD8oG4Cg&redir_esc=y#v=onepage&q=%22his%20murder%22&f=false)

**Being the murderer**

- "The defection of Bogdan Stashinsky in 1961 was prompted not by his revulsion of his murder of the Ukrainian politician, whom he killed with an ingenious cyanide gas gun in October 1959, but [...]" [(The A to Z of Sexspionage)](http://books.google.com/books?id=ceFOYQFVR9UC&pg=PA274&dq=%22his+murder%22+cell&hl=en&sa=X&ei=RMpGU52QKqKa7QbCp4CQDw&ved=0CGMQ6AEwCTgU)

- "The murderer is presented as having committed his murder in the necessary pursuit of his duty." [(Psychoanalysis, Literature and War: Papers 1972-1995)](http://books.google.com/books?id=LGmbpPc0U_EC&pg=PA104&dq=%22+committed+his+murder%22&hl=en&sa=X&ei=YchHU7-NLuSr7Abi3YG4Cg&ved=0CD4Q6AEwAw)

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CREDITS

I would like to credit DamkerngT for the idea of using the verb *"commit"* to provide enough context to interpret *"his murder"* as *"his murder of a victim"*.