The 2002 true-crime film Vampire Clan dramatizes the shocking real-life murders carried out by a group of teenagers who believed they were part of a vampire cult. Starring Drew Fuller as cult leader Rod Ferrell, the film follows how fantasy role-playing and obsession with vampirism spiraled into violence, ultimately leading to the brutal killing.

The case of Rod Ferrell and the brutal Wendorf Murders began as a group of teenagers role-playing vampires spiraled into real-world violence when Ferrell, who called himself a 500-year-old vampire, led members of his so-called “Vampire Clan” to the home of Richard Wendorf and Naomi Wendorf in Eustis, Florida.

Sources:
Killer Kids 
Vampire Clan (2002) 
The Vampire Murders (1999) 
https://www.yahoo.com/entertainment/teen-vampire-cult-leader-rod-203422626.html
https://www.dailycommercial.com/story/news/local/eustis/2019/12/01/mother-of-vampire-cult-killer-ive-changed/2178130007/
https://www.orlandosentinel.com/1998/07/16/cooper-pleads-guilty/
https://www.tampabay.com/archive/1998/11/22/more-evidence-turns-up-in-vampire-cult-deaths