The Question and Answer section for Rear Window is a great resource to ask questions, find answers, and discuss the novel.
By the end of the selection, Thorwald is attempting to strangle Thorwald, and Miss Lonelyhearts has been distracted from her intended suicide. The violence is caused by Jeff's suspicions, and Lisa's investigation.
Are you referring to the movie "Rear Window"?
I believe you've placed your question in the wrong category. Please repost in the correct category, so I am aware of what novel you are posting your questions for.