A man and woman sought in connection with the murder of a pregnant Bronx mother of three surrendered Monday. Police say they have been searching for Robert and Maria Coakley, both 47, since the stabbing death last week of 37-year-old Marilyn Ginel. She was nine months pregnant at the time and her unborn baby did not survive. Cops say her three other children were in the apartment during the attack. Police believe Robert Coakley and Ginel had been involved romantically, but Coakley returned to his ex-wife.