In what has been termed as a large-scale drug ring by law enforcement officials, a Bethel man facing federal charges has reached a plea deal with prosecutors.

According to court records, Mark Mansa, 46, who was arrested in February on federal drug charges, is scheduled to appear before U.S. Judge Vanessa L. Bryant on Nov. 16 to enter a new plea in the case.

The investigation into the drug ring, which started in 2005, included Danbury Police Department detectives and personnel from the U.S. Drug Enforcement Agency.