[laughs] >> doctor yazeed essa was gone.e had died a puzzling death heat up and abandon his two young children. his job as an er doctor just flat vanished. rosie's brother dominic filed a missing person report with the police. then, headed down to yaz's house and started his own investigation. >> my entire family spent the week at the house. we were playing detectives. trying to figure out what happened. >> what was the puzzle piece telling? you >> rosie died on a thursday, less than 24 hours later he sends a blast email to all his friends that said, just wanted to let you know that rosie died yesterday in a minor car accident she will be missed. >> that's it? >> that was the email. >> you will be missed. >> the mother of his two children. blast email! for >> credit card transactions dominic eventually learned that years had blocked a plane ticket. final destination cyprus the island in the mediterranean. >> dominic knew it was time to tell the entire family everything. he and his brother rocky had been keeping. back about t

yazeed essa we will be eligible for parole after serving 20 years. >> that is all for this edition of dateline, i'm natalie morales, thank you for watching. this was a gruesome murder, a high profile executive and his wife shot to death in beverly hills. we don't really think that children can murder their parents. you have to have a lot of evil in you to shoot your mom and dad. >> young. rich. handsome. in a case made for hollywood, they were ready for the cameras -- >> 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 wasn't real. it just wasn't real. >> they're 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 s