his older brother, carlos ramirez says it took nearly a year the get the toxicology report, and it confirmed his heart, that this was a homicide. his brother's bank accounts were drained three days after he died, and police found multiple drugs, including fentanyl in his system. >> yeah, that was hard, you know, just to hear all that was in his body and was given to him. >> reporter: but it was the death of 33-year-old john umberger that's now leading to real answers. and it's largely because his mother from outside atlanta has loudly refused to believe that her son died of an overdose after a night on the town. >> we do not want john's death in any way to be in vain. >> reporter: we went with her on one of her many trips to new york with family and friends where she is putting pressure on authorities to dig deeper. >> we have to keep showing up and to keep saying this is not right. >> i also believed there are countless cases of victims who were too embarrassed, ashamed to come forward. >> reporter: yeah. >> and i would urge them, please come forward. >> reporter: police found her son dead

nos acompaÑa el doctor neurÓlogo carlos ramÍrez mejÍas.lve permanente. doctor: los cambios que se ven en el cerebro son permanentes son cambios estructurales permanentes? >> son permanentes y el estrÉs continÚa. doctor: cÓmo lo revertimos? si el estrÉs nos estÁ quitando concentraciÓn, habilidad de tomar decisiones en el trabajo con nuestra familia? >> este es el cerebro que nosotros siempre queremos y tenemos, es rÍgido. es como una piedra, pero nuestro cerebro es como plastilina. entonces lo que tenemos que hacer es desarrollar estrategias para que nuestro cerebro cree nuevas conexiones y sea plÁstico. que podamos crear mÁs neuronas, mÁs conexiones y logremos que el cerebro funcione de manera ideal. entonces los pasos concretos que las personas pueden empezar a hacer ahora para evitar que el estrÉs nos afecte desde el punto de vista neurolÓgico? >> entender el papel negativo que tiene el estrÉs en nuestras vidas, tratar de vivir el momento. la gente cree que el cerebro puede hacer muchas cosas, nuestro cerebro puede hacer una cosa a la ve