>>reporter: now, this is what he looks like today, he is 39 years old being held at the kentucky state penitentiary. the first time he is going to be eligible for parole will be on may 18, 2019, just over three years from now. >> thank you. >>> in the aftermath, experts often try to better understand the motive and answer one of the most asked questions, why? school shootings often stem from anger, students were bullied take their frustration out of those they say cause them to feel less than. the typical response, returning violence for violence without thinking about the long-term effect. >> just thinking through consequences, which is really good for teenagers. part of their brains have not developed yet.>> psychologists typically do risk assessments to determine how serious a child is what they make threats. experts also say social media plays a factor in exposing children to violence and other negative content prematurely.>>> we have a look at your forecast, steve riley joins us. >> as we look at it we have ourselves some changes set for tomorrow. here we are in the tri-state tomorrow. however

." >> at kentucky state penitentiary, some inmates can apprentice in an auto body shop. at rikers island jail, a bakery churns out nearly 90,000 loaves of bread per week while teaching inmates how to bake. in many of the prisons profiled on "lockup," inmates have opportunities to learn skills that can help them find work on the outside. but all too many spend their time honing skills more suitable to mayhem and murder. >> i stabbed an inmate 12 times. over some dope in front of the chow hall. >> i took a knife and i stabbed him with it three or four times, until he was dead. then i butchered him with it. >> you find a piece of metal or something, file it down on the concrete. it ain't got to be sharp. just has to have a point. put a handle on it, do what you need to do. >> "lockup" crews are regularly exposed to the tools of a deadly trade. >> in every prison we film in, there's always a shank museum, a place where the authorities display all the weapons that are confiscated by staff. ♪ homemade weapons the inmates have made from bed springs or melted down plastic. i mea

still, there are those inmates like alex bennett, at the kentucky state penitentiary, who don't alwaysgree with, or abide by, the rules. >> i'm a person that's been in the joint all of my life. i've been told i'm pretty hard core. and i need a certain type of environment. >> now, you got something you want to say to me now? we can get it on national tv here. >> everything about alex's mannerisms, his appearance, and the words that he spoke, said convict. alex just embodied that. >> bennett was 54 years old when we met him and had spent 33 of those years behind bars for armed robbery, kidnapping, and murder. >> the system today isn't like the system that i came into 36 years ago. the system today has the majority of their inmates programmed to do what they're told when they're told to do it. and so they get to the point where they expect that from everybody. well, there's still a few old dogs around who like to do things their own way. >> bennett's way of doing things, however, has had horrifying results. after adapting to life in a single person cell here, he was transferred to a lower

most of them within the stone ramparts of kentucky state penitentiary. >> this was like a gladiator school down here. you come down here, you won't even fight. are you going to be somebody's punk? it's just that simple. so, to survive here in here, i am fighting. and so we fought. and i whooped their ass all around this prison. >> johnson recalls the legacy of violence he unleashed on officers during his time in kentucky's three cell house, the hole. >> when they come up to my cell, said back up, handcuff, i said [ bleep ] you. you come on in here and get me. let's do it. when they come and fight me, they don't play. i like being shackled to the bed no telling how many times, maced. i was maced so much they said don't even mace him because it don't even affect him. he's immune to him. they're take and shoot me with a taser gun, whatever. because it's going to take more than that to calm me down, you know. and when they come up with something new, they come to me, and try it on me. see if it works. >> i definitely have the sense that fleece loved to have an audience. he was a great storytel

." >> at kentucky state penitentiary, some inmates can apprentice in an auto body shop.t rikers island jail, a bakery churns out nearly 90,000 loaves of bread per week while teaching inmates how to bake.