todd kohlehepp is responsible for at least seven murders. his dark past came to light when 30-year-old kala brown was found chained to a container. she and her boifl, charlie carver, were missing for two months. she was found on kohlehepp's property. she was yelling. >> she was banging very hard on the container. she was bound. there was a chain from the top of the cage to something else that went around her neck. she was distraught, panicked. >> reporter: her boyfriend, charlie carver, was not as fortunate. >> she said she witnessed him being shot. >> reporter: after he was taken into custody, kohlehepp asked to speak with his mother. she says he told her everything and apologized. >> "i'm sorry, mom." >> reporter: did he cry? >> uh-huh. his eyes looked horrible. they were red. >> reporter: why did he kill her boyfriend? >> because he got nasty and got smart mouth. >> reporter: why did he chain that girl up? >> because he didn't know what to do at that point. she saw, evidently, him kill her boyfriend. and he didn't know what to do with her