CLAY COUNTY — Anthony A. Mattison, 35, of Osceola, who is accused of killing a Columbus woman and dumping her remains in Clay County, has pleaded not guilty.
Mattison has been charged with first degree murder, use of a firearm to commit a felony, possession of a firearm by a prohibited person and improper disposal of human skeletal remains, in the case involving the death of 25-year-old Jasmine Gar…