An MS-13 gang member nicknamed “Terror” has been sentenced to life behind bars for his role in the shooting death of a Houston-area teenager. Douglas Alexander Herrera-Hernandez was sentenced to life in prison without parole after being found guilty of capital murder in the 2016 slaying of 16-year-old Estuar Quinonez, the Office of the District Attorney, Harris County, Texas, said in a release. The victim had witnessed several gang-related murders and his killers wanted to silence him forever, prosecutors said. “We are trying to break the back of this organization by sending their assassins to prison for as long as possible and we will remain unrelenting in our pursuit of these criminals who band together to terrorize communities,” Harris County District Attorney Kim Ogg said in the release. Prosecutors said Herrera-Hernandez admitted to contacting MS-13 gang leaders in El Salvador to sign off on Quinonez’s murder. Herrera-Hernandez and several other …