Director Tiller Russell spent 14 years researching Enrique Camarena’s murder and two years shooting and editing the documentary, "The Last Narc."

Russell also interviewed Camarena’s widow, Mika Camarena.

The director traveled to the house in Guadalajara where Camarena was tortured for 30 hours and murdered with a blow to the head.

“It was sort of eerie and ominous and almost ghost-like. In fact, nowadays the location is actually an elementary school. And so, all the exteriors that you see at the location are actually shot there in Guadalajara where it happened,” he said.

Russell interviewed the lead DEA agent in charge of Camarena’s murder investigation.

The retired agent, Hector Berrellez, claims a former CIA agent participated in the torture of Camarena in order to find out what the agent knew about U.S. government connections to the drug cartels.

“Kiki Camarena was picked up because he was about to uncover that U.S. intelligence officials was [sic] protecting the drug lords,” Berrellez said in the documentary.

The documentary points the finger at a Cuban former CIA agent named Felix Rodriguez, who has denied any involvement in Camarena’s torture.

Other bombshell interviews include those with former Mexican police officers, who said they were inside the house while Camarena was being tortured.