KMTVOmaha Man Pleads Guilty to Killing Mother, Half BrotherABC NewsA 25-year-old Omaha man has pleaded guilty to killing his mother and his 4-year-old half brother to avoid the death penalty. Roberto Martinez-Marinero pleaded guilty Wednesday in Douglas County District Court to two counts of first-degree murder in the ...25-year-old pleads guilty to first-degree murder in deaths of mother, 4-year-old brotherOmaha World-HeraldMan pleads guilty to killing mother, half brotherWashington TimesKiller gets life for murders of Jesus and Josue MarineroWOWTKETV Omaha -KMTVall 9 news articles »