'Sibling Rivalry' Was Woman's Motive for Killing Sister and 3-Week-Old Niece, Police Say

An 18-year-old mother and her three-week-old daughter were shot and killed in September -- and this week, the woman's older sister was arrested in connection to their deaths. On Wednesday, Fresno Police arrested 22-year-old Yarelly Solorio-Rivera and 26-year-old Martin Arroyo-Morales (below), Yarelly's boyfriend. The pair were charged with two counts of murder, stemming from the deaths of Yanelly Solorio-Rivera and her baby girl, Celine (above). "We can now say with complete certainty that we ha...