Some legal background: this is filed in California state court. I believe it's a wrongful death action. Usually, in California, suicide defeats a defendant's liability, as it is an unforeseeable, "superseding cause" that breaks the causal link between the defendant's conduct and the injury. Yet causation can be established if the plaintiff can prove that the defendant's conduct triggered an "uncontrollable impulse" to commit suicide. If the decedent was still able to control himself and realize the nature of the act, then liability is precluded.