illness overwhelmed his son. >> dreher: there you go, chris. >> pelley: chris dreher's family, nearoulder, was devoted to his care. psychologists, psychiatrists, medication-- but chris was tortured by anxiety. >> dreher: he worked at a place and he bought a pistol from one of his co-workers. his long-term psychologist said that he should not have any guns because he had suicidal ideation at that point. so we took 'em away, took it away and locked it up. but then he started telling me that, well, he could just go out and buy another one. >> pelley: and so, you were faced with the reality that he could ha ge >> dreher: yes. i made a deal with him. i said, "i'll give you the guns back, but you have to let me put trigger locks on the guns, and i'll have the keys. and he found a way to get 'iem off. and one-- one night, you know, when he was having some issues, apartments. and... and he committed suicide that night. >> pelley: how old was he? >> dreher: 20. >> pelley: 20. >> dreher: 20. 20-years-old. >> pelley: suicides-- and memories of massacres including columbine and the aurora theat