0 Man Convicted of Brutal Gang Attack on 15-Year-Old Girl (Fairfax County, VA Posted by Randy Crank on November 16, 2017 at 2:09am n MS-13 gang member charged in the brutal killing of a 15-year-old girl has been found guilty. Wilmer Sanchez Serrano, 21, was convicted Tuesday of second-degree murder in the death of Damaris Alexandra Reyes Rivas