He’s got killer instincts.

A self-described “demonologist” is speaking out about what motivates serial killers after decades spent studying murderers and performing exorcisms across the US.

Chris DeFlorio first came into contact with the depraved and deranged during his 19-year stint as an officer for the New York Police Department.

The Big Apple native later became interested in “religious demonology” and quit the force to become a full-time exorcist.

Today, he operates the New York Demonic Investigation — a non-profit that sees him try to expunge evil spirits from those with homicidal tendencies.

“I believe the public and law enforcement can be educated in what to look for through a checklist of warning signs,” the exorcism expert declared in an interview with Jam Press on Friday.