(CNN) A 24-year-old man has been taken into custody in connection with the shooting death of reputed New York crime boss Francesco "Frank" Cali, the New York Police Department said.

Anthony Comello

Cali's killing does not appear to be mob-related, a source with knowledge of the investigation told CNN on Sunday.

Anthony Comello is being held in a New Jersey jail and will be charged with murder formally when he's extradited to the borough of Staten Island, where the killing happened, NYPD Chief of Detectives Dermot Shea said at a Saturday news conference.

"While we believe we have the shooter in custody for this incident, the investigation is far ... from over," he said. "The investigation will turn to were other parties involved in this, gathering future and additional evidence and working on the motive for this particular crime."

Shea didn't give details about how Comello became a suspect.

Read More