SPRINGFIELD-The sole survivor of a fatal shooting attack that left an Effingham County father and son dead said Wednesday she does not know who shot her. Linda Heidt testified Wednesday in the double murder trial of her son, Craig Heidt, that she could not identify who shot her and killed her husband Philip and son Carey in Philip and Linda's home in August 2008. Jurors heard Linda Heidt's desperate 911 call in the minutes after her husband and son were fatally shot.