A Dominican national was convicted earlier this week by a federal jury in Boston of laundering close to $1 million in fraudulently obtained IRS refund checks using 11 different bank accounts at five different banks.

Francisco Oscar Grullon, 52, was convicted following a six-day jury trial of one count of conspiracy, 15 counts of theft or conversion of United States property and one count of conspiracy to commit money laundering.

Grullon conspired with an attorney, R. David Cohen, who was convicted in 2016 for his role in the scheme, to deposit and launder over 100 fraudulently obtained tax refund checks.

The checks were based on fraudulent tax returns with false W-2 information, usually using the name and Social Security number of a resident of Puerto Rico, where residents are not required to file federal income tax returns. Once the fraudulent returns were accepted by the IRS, refund checks were sent to addresses in Lawrence, East Boston and New York.

Grullon and his co-conspirators obtained and negotiated close to $1 million in fraudulent checks into bank accounts in the name of a front company, AD Professional Association Inc., and in Cohen’s attorney-client trust accounts, from October 2011 until November 2013.

When questioned by bank officials about the suspicious quantity of U.S. Treasury checks, Grullon falsely claimed that he was depositing them as a favor for friends and that he had a check-cashing license.

After their bank accounts were closed by several financial institutions, Grullon and Cohen recruited a third co-conspirator and directed him to open accounts for AD Professional Association Inc., deposit more than $500,000 in Treasury checks and make hundreds of thousands of dollars in cash withdrawals.

Grullon was arrested in the Dominican Republic and extradited to the United States in 2018. Sentencing is scheduled for July 24.