Police said rival gangs often mark their territory with graffiti. Plea agreement results in prison sentence of 11 to 22 years  By Kathleen Brady Shea, Managing Editor, The Times A 19-year-old Delaware resident admitted his role Monday in the gang-related double murder that occurred nearly a year ago in New Garden Township. Cristian Eumana, 19, of Greenville, Del., pleaded guilty to two counts...