"It's a sad day when an officer is charged for doing something he was trained to do," said Fraternal Order of Police spokesman Pat Camden, who criticized the charges and insisted Servin's name will be cleared through the trial, the Huffington Post reports.

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Stories differ as to what happened the night of the shooting, Servin claims that he left his home "to get a burger." He also left his home armed with an unregistered Glock 9 millimeter semi-automatic handgun, DNAinfo Chicago reports. Prosecutors say that Servin confronted Boyd and her friends as they were leaving a park near Servin's home. Words were exchanged. Servin claims that one of men with Boyd, Antonio Cross, pulled a gun, prompting Servin to fire in self-defense. Cross was shot in the hand and Boyd was hit in the back of the head. She died two days later. No weapon was recovered at the scene, the Huffington Post reports. Boyd's family received a $4.5 million wrongful death settlement from the city in March.

Read more at DNAinfo Chicago and Huffington Post.