An Atlanta mother who pleaded guilty to killing her newborn child has agreed to a medical sterilization procedure to avoid prison. The plea deal Tuesday halted the murder trial of Carisa Ashe, 34, who has seven other children, after she consented to undergo a tubal ligation, in which the fallopian tubes are cut and tied to prevent pregnancy. Fulton County District Attorney Paul Howard, whose office suggested the plea deal, said he agreed to reduce the murder charge to voluntary manslaughter because Ashe suffered from postpartum depression when she shook to death her 5-week-old daughter, Destiny, on Dec. 16, 1998....