Note: This article was updated March 8 at 10:40 a.m. to include the status of Williamson, Thibedeau and Zuluaga. It was updated again at 11:20 a.m. to note that Harrington and Williamson worked out of the Union Square post office.
Gerard Harrington, 48, of Stoneham, who formerly worked as a postal worker at the Union Square post office, pleaded guilty in federal court Wednesday to charges of cocaine trafficking, according to an announcement from the U.S. District Attorney's office.
Harrington was accused of selling cocaine while on duty at the post office. Another former Somerville postal worker, Sean Williamson, of Peabody, was also accused of cocaine trafficking, along with two other men: William Zuluaga, of East Boston, and John Thibedeau, of Waltham.
Williamson is expected to plead guilty at a hearing on April 5, according to the U.S. District Attorny's office, and Thibedeau is expected to do the same on April 23. Zuluaga pleaded guilty on Jan. 18 and is schelued for sentencing on April 25.
According to the statement, Harrington pleaded guilty to one count of conspiracy to possess with intent to distribute cocaine and five counts of possession with intent to distribute and distribution of cocaine. He's scheduled to be sentenced on June 12.
According to prosecutors, the government has video and audio evidence of the four men conducting drug transactions between May, 2011 and Sept., 2011, the statement says.
The men face up to 20 years in prison, three years of supervised release and up to $1 million in fines.