A mother whose 5-year-old was found dead in a suitcase along a Massachusetts highway two years ago has pleaded guilty to abusing and endangering her two surviving children. Elsa Oliver is no longer facing charges related to the disappearance and death of 5-year-old Jeremiah Oliver, but pleaded guilty to assault and battery and two counts of reckless endangerment to her two surviving children, Worcester County District Attorney Joseph D.