HAVERHILL (Ma.)-- An allegedly drunk Haverhill dental assistant told police, “I killed somebody. Shut the (expletive) up. This is going to change my whole life,” after crushing a saintly church leader to death with her car early yesterday morning, prosecutors said this morning. Lisa Leavitt, 37, was ordered held today on $50,000 cash bail after tearfully pleading not guilty to motor vehicle homicide while drunk and negligent operation for causing the death of Karen LaPierre, 63, of Haverhill. LaPierre was a longtime foster mom who had cared for more than 160 kids, collected Christmas presents for 1,000 needy children and...