If a murder confesses his crime to a priest, do you think that priest has an obligation to tell the police?

Even though his vows say he shall not reveal anything that has been said. what if what was confessed was a murder? should he forsake his vows and tell the police?

I'd like to hear from Catholics and other Christians especially
Updates
+1 y
http://www.imdb.com/title/tt0045897/ got the idea for this question from the movie I Confess by Alfred Hitchcock
If a murder confesses his crime to a priest, do you think that priest has an obligation to tell the police?
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