here's my "nightline" coanchor byron pitts. >> reporter: duwan rice is just 19 years old but he's already had to say good-bye to seven friends, each one murdered. and he's fed up. >> that's cold, bruh. >> reporter: paying respects to two brothers buried in one plot, shot to death on the same day. he tells us he didn't cry when they died. but the tears coming now. and something else. what are you feeling? >> pain, man. like real pain, bruh. >> reporter: grappling with an urge to avenge his friends' violent murders duwan pulls out his phone. he's about to make a life or death decision -- whether to call his boys and retaliate. >> have to sit back. i got to think. whether to go left, whether to white mazda -- >> a brother and sister shot to death in richmond last night -- >> reporter: this potent mix of pain, anger, and teenagers with guns make his hometown of richmond at one point one of the deadliest cities in america. the streets are hunting grounds. corner after corner, young men running for their lives. the puffs of smoke, bullets. chased by an armed rival. here a calculated hit is unde

here's my "nightline" coanchor byron pitts. >> i want you guys to be safe, stay with you >> reporter: pennsylvania's attorney general kathleen cain at the peak of her power. when running away from danger was never her m.o. >> we can get out, right? >> hm, i wouldn't. but you're the boss. >> we're getting out. >> reporter: on this day she's in philadelphia with the gun violence task force to find a fugitive accused of attempted murder. but cain says the real danger she never saw coming, not from criminals, but her colleagues. a discovery that has shaken her career in jeopardy. >> porngate scandal. >> 398 pages, much of it hard-core porn -- >> names have been named, x-rated material exposed -- >> reporter: a trove of e-mails her office discovered and made public full of racism, sexism, and pornography. >> the first time you saw these e-mails what was your immediate reaction? >> oh my god. >> reporter: the scandal has been dubbed porngate. but perhaps most shocking, who sent and received those e-mails. some of the state's highest-ranking officials. >> judges, law enforcement -- >> report