Attorneys for the family of Michael Brown announced Thursday they are filing a wrongful death lawsuit against Ferguson, Missouri and Darren Wilson, the officer who shot and killed the unarmed black 18-year-old last August.

Brown’s death on August 9, 2014 sparked civil rights protests around the country, which continued to grow after a series of high-profile police killings of unarmed black men and women.

“We are officially in the process of formulating a civil case that we anticipate will be filed shortly on behalf of the family,” said Anthony Gray, one of the family’s attorneys, during a press conference Thursday.

The announcement comes a day after the U.S. Department of Justice said it would not bring federal civil rights charges against Wilson for killing Brown.

SCROLL TO CONTINUE WITH CONTENT