The on Washington Street will bear the name of fallen .
Although last year to rename the building, Sen. John Kerry made the renaming official with a presentation in Woburn Friday morning.
"What a privilege it is for me to be here to honor the memory of a remarkable police officer who gave his life for the city of Woburn," said Sen. Kerry. "Jack, as everyone knew him, put his own life on the line."
Sen. Kerry said that Officer Maguire set an example that others follow, including police officers in New Hampshire who are who was killed in the line of duty Thursday night.
Officer Maguire was by armed robber Dominic Cinelli outside of Kohl's Department Store. Although he was felled by four gunshots, Officer Maguire fatally shot Cinelli, killing the longtime criminal.
"It's a tremendous honor to him," said Desiree Maguire, Jack's widow. "We are so proud of my husband. He did make the ultimate sacrifice."
Officer Maguire's three children, Sean, Bryan and Tara, were on hand to receive a plaque commemorating the naming of the post office. Officer Maguire's brother, Chuck, was also at the ceremony.
"This means a lot to the Maguire family and the city of Woburn," said Mayor Scott Galvin. "He meant a lot to the community. He was a great police officer."
With the line of duty death in Greenland, NH last night, Sen. Kerry said everyone is reminded of the dangers of police work.
"We remember what service really means," said Sen. Kerry. "When a law enforcement officer goes out, their family knows there is a legitimate question of whether they will come home that night... What happens every single day shows how important it is to have these people."
"We need to say thank you every day," the senator added.
Desiree Maguire said Friday that she was overcome with emotion when she heard the news of Chief Maloney's death. The line of duty shooting brought back many memories for herself and Officer Maguire's children.
Mayor Galvin said he hopes that the town of Greenland is able to rally together, as Woburn did after Officer Maguire's death.
"We have a strong community here," said Mayor Galvin. "We were able to bond and turn something awful into a positive."