Commonwealth’s Attorney C. Phillips Ferguson has a big job ahead of him, and he isn’t speculating on how long it will take.

Ferguson is tasked with reviewing the file in the case of an officer-involved shooting on Dec. 28 that led to the death of a 28-year-old Suffolk man.

Corey Jason Achstein, of the 200 block of Causey Avenue, died that night after being shot by Suffolk Police Officer James Babor. He and another officer arrived on scene after receiving a call at 5:15 p.m. about an armed man chasing three juveniles down Causey Avenue, according to previous city press releases.

“We’ve just gotten the information,” Ferguson said. “We’ve got work to do, look at it and go through it and the whole nine yards.”

Ferguson wouldn’t guess at a timeframe in which his review might be complete.

“It will be whatever time it takes,” he said. “We review all of the facts. If there’s additional information I need, I’ll either go to the police department and ask for it, or I’ll have my own investigators get it.”

In the last deadly officer-involved shooting in Suffolk, which happened in March 2010 and in which Babor was one of two officers who fired, Ferguson’s decision was released less than two months after the incident. The police investigation alone took longer than that in the most recent case. It was turned over to Ferguson’s office on March 18.

Ferguson said the Virginia State Police was not involved in the investigation.