A Chicago man connected with supplying heroin to Duluth in 2013 was convicted of distribution of heroin in a U.S. court in Chicago on Thursday.

Brian Thurman, 44, was identified as the supplier in connection with a drug trafficking organization after the Duluth Police Department seized 500 grams of heroin transported from Chicago to Duluth in August 2013, according to a Facebook post made by the Duluth Police Department. The heroin was hidden in a spare tire of a vehicle.

The Duluth Police Department began investigating the drug trafficking organization because it was supplying large amounts of heroin to Duluth and Superior, the post states.

Investigators from the Duluth Police Department, Superior Police Department, the Lake Superior Drug and Violent Crime Task Force, and the Bureau of Alcohol, Tobacco and Firearms conducted “extensive follow-ups” to identify Thurman as the supplier, the Facebook post states.

According to the post, the Lake Superior task force as well as Duluth and Superior investigators worked with Chicago authorities to build a case against Thurman.

Thurman was the dean of discipline at Joseph Academy in Des Plaines, Ill., at the time of his arrest.