her son john jukea has been behind bars since 2005, convicted of murdering a college sophomore. >> john't belong there. >> where does he belong? >> home. >> reporter: it was known in the new york tab lids as the grid kid murder, short for grid iron. but doreen was convinced her son was innocent. >> does it ever cross your mind that maybe john did have something to do with this? >> no. i'm a hundred percent sure he did not. >> how can you be sure? >> the facts. just follow the facts. >> reporter: these facts, doreen said, led her to take matters into her own hands. going under cover and drastically changing her appearance, all to try to clear her son's >> there's a part of me that's sympathetic to her. and i almost admire that she stood by him to this point. but john jukea is not the victim in this case. it's mark fisher. >> reporter: columbus day weekend 2003. mark fisher heads to the big apple to explore the city's hopping bar scene. >> mark fisher was every parent's dream, a big, strapping, good looking student athlete, the prom king in his high school. phenomenal football player. >>