CSI: Crime Scene Investigation Season 4 Episode 21

Three crimes are explored in this episode. Firstly, an employee of an amusement park is found dead due to head injury, near a roller coaster accident where a car came off the tracks, leaving several passengers dead. Foul play is suspected. It is believed the murder and the roller coaster damage are linked. Also, a 13-year-old girl is found dead outside, again cause of death from a head injury.