Former U.S. Postal Service Employee Pleads Guilty to Drug Trafficking

A former U.S. Postal Service employee pleaded guilty in federal court Thursday to charges stemming from his involvement in a drug conspiracy, according to a Massachusetts Department of Justice press statement.

Sean Williamson, 42, of Peabody, pleaded guilty to one count of conspiracy to possess with intent to distribute and five counts of possession with intent to distribute and distribution of cocaine, according to the statement.

Williamson, along with alleged co-conspirators John Thibedeau, William Zuluaga and Stoneham resident Gerard Harrington, were , according to the statement. Harrington and Williamson are former Postal Service employees who worked out of the Somerville Post Office, reads the statement.

The prosecutor told the court that the government’s evidence included video and audio recordings of the four co-conspirators conducting their drug transactions beginning in May 2011, and continued on at least five different occasions through Sept. 30, 2011, the date of Williamson’s arrest, reads the statement.

Judge George A. O’Toole, Jr. set sentencing for July 17 at 2 p.m., according to the statement. Williamson could get up to 20 years in prison to be followed by at least three years of supervised release, and up to a $1 million fine on each count, according to the press statement.

U.S. Attorney Carmen M. Ortiz and Rafael Medina, special agent in charge of the U.S. Postal Service, Office of Inspector General, Northeast Area field office, made the announcement Thursday.

The case is being prosecuted by Assistant U.S. Attorney Eugenia M. Carris of Ortiz’s Public Corruption and Special Prosecutions Unit, reads the statement.