You need to do. >> one of holman's most notorious inmates, bobby gilbert, is serving multiple sentences for crimes committed inside prison. >> i'm serving a life without parole sentence, two life sentences, two 99-year sentences, a 40-year sentence, a 20-year sentence and a 10-year sentence. all together. >> gilbert has attacked several prisoners and stabbed one man to death at another prison during an argument. >> everybody wants to talk about, you know, i killed somebody over a carton of cigarettes. it's not a carton of cigarettes. that may be the catalyst that leads to something, but if som...