BROCKTON — A Brockton man previously convicted of kidnapping and aggravated assault has been sentenced for his role in a conspiracy to distribute fentanyl throughout southeastern Massachusetts.

The U.S. Attorney's Office said 31-year-old Filomeno Monteiro will serve three and a half years in prison and six years of supervised release after he was sentenced on Wednesday.

In July 2021, Monteiro pleaded guilty to one count of possessing and conspiring to distribute 40 or more grams of fentanyl, and one count of distributing fentanyl.

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He was caught after a two-year investigation into fentanyl traffickers in southeastern Massachusetts.

Monteiro worked with co-defendant Christian Collins in Plympton to sell 20 grams of fentanyl to an undercover cop and a cooperating witness in December 2019.

At the time, he was on probation for kidnapping and aggravated assault.

He also holds prior convictions for dealing heroin, cocaine, and marijuana, according to the U.S. Attorney's Office.

His co-defendant Collins was sentenced in December to five years in prison after pleading guilty in June.

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