>> as weird as it may seem to people on the outside, you can have one day an inmate stabbing and killing somebody and the next day, he's normal. because that's just him. and as being an officer in here, you can't tell. you can't hold a grudge. you have to come back and do your job. next on "lockup" -- >> you don't know if he's going to try to attack you. i mean, usually they attack you. >> an inmate refuses to leave his cell, forcing a showdown with officers. congratulations. congratulations. congratulations. today, the city of charlotte can use verizon technology to inspire businesses to conserve energy and monitor costs. making communities greener... congratulations. ... and buildings as valuable to the bottom line... whoa ! ... as the people inside them. congratulations. because when you add verizon to your company, you don't just add, you multiply. ♪ discover something new...