HAVERHILL (CBS) — Haverhill Fire Chief Richard B. Borden died Sunday afternoon at his home.

Haverhill Police and Fire Departments responded to Borden’s Rosemary Ave. home at 3:30 p.m. after a report the 56-year-old was unresponsive. He appears to have died of natural causes, said police Captain Robert P. Pistone.

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“Fire Chief Richard Borden was a dedicated public servant who worked tirelessly for the city of Haverhill and will be missed by the people of Haverhill,” said Haverhill Mayor James J. Fiorentini.

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Public. Safety Commissioner Alan DeNaro called Borden, “a dedicated fire professional who was very proud of the Haverhill Fire Department and all it has accomplished under his tenure”.

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Flags will be flown at half mast in Haverhill on Monday in honor of Borden.