What about this film? In this film, Miss Libby’s first "killing of her husband" and the second time of killing her husband were caused by two different behaviors. In other words, these two facts are independent of each other. Therefore, the police can arrest her, and the court can try her again. Of course, at the end of the film, she is actually a legitimate defense and should be innocent.
To give the simplest example, thief A stole victim B once last year and was sentenced to one year in prison for theft. Come out this year, A steals B again, then the court has no way to get A? Can A stole B unscrupulously forever?
Of course not. Similarly, Libby cannot.
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