The First 48 is an American documentary television series on A&E. Filmed in various cities in the United States, the series offers an insider's look at the real-life world of homicide investigators. While the series often follows the investigations to their end, it usually focuses on their first 48 hours, hence the title. Each episode picks one or more homicides in different cities, covering each alternately, showing how detectives use forensic evidence, witness interviews, and other advanced investigative techniques to identify suspects. While most cases are solved within the first 48 hours, some go on days, weeks, months, or even years after the first 48.