Billboard honoring Chicago cop killed in the line of duty vandalized Billboard of fallen Chicago police officer vandalized There is anger from a former top cop after vandals struck a billboard dedicated to a fallen Chicago police officer who was killed in the line of duty. CHICAGO - There is anger from a former top cop after vandals struck a billboard dedicated to a fallen Chicago police officer who was killed in the line of duty. About a month ago, billboards honoring Chicago police officers were put up across the area and so far, graffiti has been sprayed on four of them.