Scene 1: Here is when Othello finally says something to Desdemona, and she soon finds out that she is going to be killed. She doesn't know what her husband is taking about, and she pleads for one more night to live but Othello is firm on his decision.
Scene 2: Othello takes out all of his anger that he was holding and he strangling Desdemona... to her death.
Scene 3: Emilia comes to realize what Othello has done as she sees Desdemona laying on the bed. She runs to get everyone so they can see the catastrophe.
Scene 4: Cassio kills his wife, Emilia, because she keeps yelling. Othello soon realizes that Iago was lying about the whole situation, but It is far too late.
Scene 5: Now that Othello sees Iago's scheme, he feels weak. He feels as if he is a screw up, and he just wants to take all his anger out on someone. Therefore, he takes his anger out on Iago by stabbing him. Although he got stabbed, Iago does not die.
Scene 6: Othello feels like he betrayed Desdemona. He should have believe his beautiful wife, instead of Iago the snake. He takes his own life by stabbing himself, as he feels so wrong for his actions.