In a chilling new documentary, Kermit Gosnell, the convicted Philadelphia abortionist whose clinic resembled a house of horrors, defends himself from charges that he is a cold-blooded killer who butchered babies and kept their severed body parts as trophies.

“I very strongly believe in my innocence, and there are a number of people who believe that,” Gosnell said in an interview teased in the trailer for the upcoming documentary, 3801 Lancaster: An American Tragedy.

Gosnell was sentenced to life in prison in 2013 for the murder of a baby who had been born alive. He had reportedly snipped hundreds of babies’ necks with scissors after they had survived botched abortions When investigators searched his clinic, they found blood spattered walls and doors, baby body parts loosely packaged in milk cartons and ziplock bags, and several intact babies who would have lived had Gosnell not killed them after they were born alive.

Towards the end of the trailer, Gosnell offers an explanation for his actions in an interview recorded over the phone from prison: “A practical man changes to live within his society. Impractical man has the priority of changing society to meet his own needs. Therefore progress can only be accomplished by impractical man.”

When asked if he believed that he was an impractical man, Gosnell responded: “No question.”

This latest film is an extension of the organization’s previous short film entitled 3801 Lancaster, which won “Best Short Film” at the 2013 Justice Film Festival. The documentary will focus on Gosnell as a person, as well as his mental state when he was an abortionist. The film will be released November 10 to local theaters upon request, with the help of Tugg.com, a crowd-sourcing site.