The movie name has something like vow if am not mistaken.the lady;s character name is mary.it's about a lady whose purse was snatched but was later returned by a good man.the became friends and got married,she found out her husband was into crime and choose to leave but was stabed by him.

Alias Mary Smith (1932) (http://movies.amctv.com/movie/83400/Alias-Mary-Smith/overview)?