Charged with first-degree murder in the case are Ventura-Quintanilla , 22 , of no fixed address ; Lozano , 32 , of Germantown ; Ysaud Flores , 30 , of Gaithersburg ; Ana Abarca , 18 , of Reston ; Daniel A. Zavala , 26 , of the District ; and Silvia Martinez , 19 , of the District .