Stalkers become obsessed with others and harass them or give them unwanted attention. The situation doesn't always reach the point of violence, but when it does it can turn deadly. Although cases involving celebrity stalkers often get the most attention, civilians can also be subjected to the practice. This series tells the stories of people who were killed by the stalkers who zeroed in on them. Interviews with the people closest to the victims -- spouses, children and parents -- are used to illustrate how the stalking evolved and eventually led to murder in each case.