WOBURN, Mass. — A tentative trial date has been set for an Irish nanny charged with murder in the death of a Massachusetts baby.Aisling (ASH'-ling) Brady McCarthy has pleaded not guilty in the January death of Rehma Sabir (REM'-uh suh-BEHR'). The Cambridge, Mass., girl was hospitalized on her first birthday with severe head injuries and died two days later.An April 7, 2014, trial date was set during a hearing Thursday in Middlesex Superior Court.