What are the functions of a forensic nurse during the investigation of a violent crime, as illustrated in the BTK killer case?

During the BTK killer investigation, forensic nurse functions included collecting evidential material for law enforcement or medical examiners, scientifically investigating the deaths of known victims, providing crisis intervention for family or friends of the victims, interacting with grieving families or friends, and offering expert witness testimony about the client's violent behavior.

The clinical example of the BTK killer case lists five functions a forensic nurse could perform during the investigation. These are collection of evidential material required by law enforcement or medical examiners, scientific investigation of the deaths of known victims, crisis intervention for family or friends of the victims, interaction with grieving families or friends, and provision of expert witness testimony regarding the client's violent behavior. The evidence presents these as possible functions illustrated by the case, not necessarily all performed by one nurse.