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A Missouri grand jury may have cleared their son's killer of wrongdoing, but Michael Brown's parents aren't through seeking justice.

In an interview on CBS' Face the Nation on Sunday, Brown family lawyer Benjamin Crump said the family will examine "every legal avenue" after a grand jury declined to indict Ferguson police officer Darren Wilson for shooting the unarmed Brown in August.

"The family greatly wanted to have the killer of their unarmed son held accountable. They really would look at every legal avenue," Crump said. 

Among the options Crump listed on Face the Nation was a civil wrongful death lawsuit against Wilson, who resigned from the Ferguson Police Department on Saturday citing safety concerns. 

Crump also mentioned pursuing a law that would require all police officers to wear video body cameras to increase transparency. In a statement immediately following the grand jury's decision last week, the Brown family had called upon angry protesters to join their campaigns for police body cameras instead of resorting to violence.

"Let's not just make noise, let's make a difference," the Brown family said in a statement.

Despite the Brown family's desires, protests over the grand jury's decisions have rocked cities across the country for the past week, and while Wilson says he resigned because his "continued employment may put the residents and police officers of the City of Ferguson at risk," it's unlikely that these protests will come to an end with his departure from the Ferguson police force.

Crump said that the family was "troubled" by both the grand jury proceedings and Wilson's assertion that his "conscience was clear" after the shooting. 

"They just feel that's just very cold," Crump said on Face the Nation. "His mother and father don't think Officer Wilson had any consideration for their child. And they wonder if he ever had a conscience. And so that's troubling to them. And we want police officers that do have a conscience in our community, not police officers that are as cold as ice and see our children as demons and criminals."