Darren Wilson is currently in discussions with the Ferguson, Missouri police department on the terms and conditions of his departure, attorney Neil Bruntrager said this week.
"There's no way in the world he can go back to being a police officer," the lawyer said.
"It's not a question of if, it's a question of when," Bruntrager said of Wilson's departure.
Wilson shot and killed 18-year-old Michael Brown in August claiming he acted in self-defense.
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"The first day he would be back on the street something terrible would happen to him or to someone that would be working with him," he told CNN.
"The last thing he wants is to put other police officers at risk," the attorney added.