>> her nephew, eric delacruz. >> this is another member of her sprawling family. her favorite. >> they treat each other like grandmother and grandson. >> she talked highly of eric. very proud of him. >> proud because he was a sailor aboard the uss ronald reagan. he had just arrived back home after a tour of asia when he heard his beloved great aunt sonia the woman he called grandmother had been murdered. he told detectives that he just knew what happened. >> he said that john bordeaux was a bad guy and if something happened to her he was the one that did it. >> john bordeaux was not hard to find. he was the one that discovered sonia's body and called the cops. bordeaux was at the crime scene when they arrived. and rodriguez immediately noticed a subtle but significant clue about this mother son relationship. >> there wasn't a single picture of her son john bordeaux anywhere. it was as if he did not exist to her. so those were concerns with us right away. police took their own pictures of bordeaux when they brought him in for questioning. >> was he in an emotional