L.A. prosecutors have charged a teen tagger accused of killing a gang interventionist as an adult.

Mark Anthony Villasenor, 16, is accused of fatally shooting 40-year-old Ronald Barron, who confronted Villasenor for tagging a wall in the Mid-City area.

The loss was felt at City Hall and LAPD headquarters, where officials rely on gang interventionists like Barron to help reduce the grip of gangs in some neighborhoods.

Read the full story at latimes.com.