Death sought for man accused of killing mom, half brother, Prosecutors plan to seek the death penalty for a Nebraska man charged with killing his mother, throwing his 5-year-old half brother in a river and leaving his 11-month-old half brother in a dumpster. Douglas County Attorney Don Kleine said Monday that several aggravating factors exist in the case against Roberto Martinez-Marinero. Authorities say Martinez-Marinero surrendered to police Thursday and said he'd stabbed his mother, 45-year-old Jesus Ismenia Marinero. The 25-year-old man also said he had thrown Josue Ramirez-Marinero in the Elkhorn River and put Angel Ramirez-Marinero in the dumpster. Authorities found a body Monday that investigators believe is Josue, but a forensic examination will be conducted for confirmation. The boy's family has been notified. Angel was found bruised but alive Wednesday in the dumpster in La Vista. His mother's body was found Wednesday night in a southeast Omaha ditch. Klein...