More than two dozen areas businesses and organizations will experience what it's like to have a killer invade them on Wednesday. The killer will be a disgruntled former employee with a gun. Actually, it will be a digital disgruntled former employee with a gun. It's part of an exercise designed to help companies develop a plan in the event of a real emergency. Chris Floyd, with the Disaster Assistance Communities Group says almost 30 companies have signed up to participate in the exercise so far.