10. Dead Man Running / Crash

For homicide detectives, the clock starts ticking the moment they are called. Their chance of solving a case is cut in half if they don't get a lead in "The First 48". Each passing hour gives suspects more time to flee, witnesses more time to forget what they saw, and crucial evidence more time to be lost forever. Follow detectives from around the country during these critical hours as they race against time to find the suspect.