If a person has witnessed the injury of another individual may the former sue the party who caused the injury for negligent infliction of emotional distress?

Yes, under two circumstances. One such circumstance transpires when the person who witnessed the injury was in the so-called zone of danger, so that they were in danger of harm themselves and suffered emotional distress.

The other valid situation arises when there is a family relationship involved between the bystander and the individual who has been injured. In this case, the party witnessing the injury of the victim to whom they are related may recover damages.