From obsessed former lovers to unrelenting acquaintances fueled by the thrill of the chase, stalkers can have a range of motivations, but all instill a perpetual fear within their victims. With over three million people falling victim to stalking in the United States each year, this widely misunderstood crime reaches far beyond celebrities and people in the public eye. Watch emotional stories of stalking victims and explore the twisted psychology of the people who relentlessly pursued them.