48 Hours Investigates about addictions. Susan Spencer, explores whether the Washington area sniper is into some kind of addiction of his own: Do serial killers get to the point where they treat their acts of violence as a "fix?" Susan also looks back at a deadly 1990 sniper case in Ohio where the gunman later explained his actions. 48 Hours Investigates also examines other addictions, like being hooked on computer games. Industry analysts are saying that more than 100 million people will be playing these games by 2005. One of the most popular of the new Internet games is Everquest, which actually has the nickname 'Evercrack' because it's so addictive. You'll hear people tonight tell you that it's virtually impossible to stop playing. We also look at shoplifting - a crime for which Winona Ryder faces trial next week. For some people, is shoplifting a habit nearly impossible to kick? Plus the original supermodel, Janice Dickinson, who says she became addicted to fame.