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>> investigators immediately took bruno santos in for questioning. >> i could describe him as a very cocky, arrogant, young man, somewhat confrontational at times, pretty hard to deal with. he told me that he had proposed to sarah or asked her to marry him, which she said yes. >> bruno and his mother claimed bruno was home asleep on the morning of the murders, but no one else could verify his alibi. >> he was cooperative with us at the time. as we started pushing him a little harder in interviews, his demeanor certainly did change. >> my first thought was bruno. we figured he was angry with diane and alan. he decided to get rid of them so that he and sarah could be together. >> investigators also found evidence that santos defied the johnsons and continued to see sarah, going so far as to have sexual relations with her in her own home. >> we confirmed that by finding