Mankato (KMKO)-A woman accused in the shotgun slaying of her husband pleaded guilty to second degree murder yesterday.  34-year-old Jennifer Nibbe testified in Blue Earth County Court yesterday, saying she doesn't remember shooting her husband James in their home near Lake Crystal on August 31st, 2010.  Originally charged with first degree murder, Nibbe admitted she was on prescription pills at the time of the shooting.  The prosecution and the defense agreed that the plea agreement was best for everyone.  Jennifer Nibbe is scheduled to be sentenced on July ninth.  She faces 25 years in prison.