A convicted Bronx killer accused of using black magic to run his murderous drug gang will walk free Monday — after a judge vacated his sentence based on newly discovered evidence.

Calvin Buari, 46, who has spent the past 22 years behind bars upstate, was serving a 50-year-to-life sentence for the 1992 shooting deaths of two men as part of a drug turf war.

Another man, Dwight Robinson, confessed to the double murder in a 2003 affidavit but was never prosecuted, police sources said. Robinson later recanted his confession.

New witnesses then came forward in 2015 claiming they either saw the person who pulled the trigger or to say Buari couldn’t have been involved, according to the same source.

After a series of hearings, Bronx Supreme Court Justice Eugene Oliver Friday tossed Buari’s 1995 conviction Friday and ordered him released without bail, over prosecutor’s objections.

A retired NYPD detective with knowledge of the case told The Post he was shocked to hear Buari would be back on the streets.

“This was a bad guy who hurt a lot of people by dealing drugs,” said the source. “I’m surprised to see a judge would let him out on just some hearsay.”

Given that the jurist’s decision came down late in the day, Buari was forced to spend two more days in Green Haven Correctional Facility before his release.

“We are deciding whether to appeal the decision or retry him,” said a spokeswoman with the Bronx District Attorney’s Office.

Additional reporting by Emily Saul