dante servin , 46 , was found not guilty of involuntary manslaughter in the death of rekia boyd , 22 , in march 2012 .
shot her in the back of the head as she stood outside a party with friends .
judge dennis porter asked her supporters to leave the courtroom .
he feared there would be outbursts after the verdict was read out .
the victim 's brother martinez sutton then screamed : ` you want me to be quiet ? this m ***** f ***** killed my sister ! '