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in you to shoot your mom and dad. >> young rich handsome in a case made for hollywood they were ready for the camera -- >> it was the first televised courtroom drama that captivated the united states it was a huge deal >> erik and lyle menendez -- convicted of murdering their own parents. >> i ran around and shot my mom! >> it wasnt real. it just wasnt real. >> theyre sociopaths -- and pretty big ones. >> now -- almost 30 years late -- chilling new details. evidence never broadcast bef...

it just wasnt real. >> theyre sociopaths -- and pretty big ones. >> now -- almost 30 years later -- chilling new details. evidence never broadcast before! a letter, hinting at secrets too dark to imagine. >> this is so outside of the norm something is going on in that house. >> did they kill in cold blood or in crippling fear? >> oh man it was gut-wrenching. i wanted to bust the door down. >> they spoke the truth about what had happened. tonight, hear from the brothers themselves. >> p...

were ready for the cameras. it was the first televiseda courtroom drama that captivated the united states. it was a huge deal. spoke erik and lyle menendez convicted of murdering their own parents. >> i shut my mom. >> it wasnt real. it just wasnt real. >> they are sociopaths. and big ones. >> chilling details. a letter ending in secrets, too dark to imagine. >> this is so out of the norm. >> did they kill in cold blood? or in crippling fear? >> it was gut wrenching. >> they spoke th...

Firing. >> in what direction? >> in front of me. >> what was in front of you? >> my parents. >> at some point was your gun empty? >> yes. could see somebody moving, seemed like moving in the direction of where my brother should be. >> reporter: lyle said he returned to the car, re-loaded, and ran back into the house. >> and what did you do after you re-loaded? >> i ran around and shot my mom. >> reporter: so did they act while in the mistaken belief they were defending their own lives? yes, said...

>> yes. could see somebody moving, seemed like moving in the direction of where my brother should be. >> lyle said he returned to the car, re-loaded, and ran back into the house. >> and what did you do after you re-loaded? >> i ran around and shot my mom. >> so did they act while in the mistaken belief they were defending their own lives? yes, said the defense. a classic case of imperfect self defense. perfect nonsense, said the prosecutor. she grilled lyle on cross examination. >> when you put ...