Darren Wilson, the officer who shot and killed Michael Brown in August, resigned from the Ferguson Police Department on Saturday, the St. Louis Post-Dispatch reports.
On Monday, a St. Louis County grand jury declined to indict Wilson in connection with the shooting, which ignited protests and rioting in Ferguson in the days following Brown's shooting as well as the days after the decision not to indict Wilson.
Wilson told the newspaper he decided to step down after the police department informed him it had received threats of violence if he continued to work for the force. "I'm resigning of my own free will," he said. "I'm not willing to let someone else get hurt because of me."
The 28-year-old had worked for the police department for six years and called resigning "the hardest thing I've ever had to do."
In his letter of resignation, Wilson said he had hoped to stay, "but the safety of other police officers and the community are of paramount importance to me. It is my hope that my resignation will allow the community to heal."
Wilson had been on paid administrative leave since the shooting. The U.S. Justice Department is still conducting a civil rights investigation into the shooting.