Murder is genetically programmed in the human mind ON May 11, 2005, a jury convicted Pete Terrazas of murdering his next-door neighbor, Miguel Ruiz. Terrazas had been dating Ruiz's housekeeper, Maria Santillana, whom he deeply loved. When she abruptly broke off the relationship, Terrazas concluded that she had begun an affair with Ruiz. Terrazas loaded his .410-gauge shotgun, went over to his neighbor's driveway, blasted Ruiz in the back and then took deadly aim at the man's chest.Pete Terrazas had never before been violent. Nor had Scott Peterson before he killed his wife, Laci. Nor had Clara Harris before she...