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n. a happening which results in an event, particularly injury due to negligence or an intentional wrongful act. In order to prevail (win) in a lawsuit for damages due to negligence or some other wrong, it is essential to claim (plead) proximate cause in the complaint and to prove in trial that the negligent act of the defendant was the proximate cause (and not some other reason) of the damages to the plaintiff (person filing the lawsuit). Sometimes there is an intervening cause which comes between the original negligence of the defendant and the injured plaintiff, which will either reduce the amount of responsibility or, if this intervening cause is the substantial reason for the injury, then the defendant will not be liable at all. In criminal law, the defendant's act must have been the proximate cause of the death of a victim to prove murder or manslaughter.