After FedEx driver Tanner Horner pleaded guilty to killing 7-year-old Athena Strand, his mother broke down in court while discussing the crime. "I am so mad at him. I want to just tear his ass up," Horner's mother, who was referred to as Mrs. Horner by attorneys, said through tears during a hearing on Wednesday, April 22, according to CBS News. "She was just a baby." Horner pleaded guilty to capital murder and kidnapping in connection to Strand's death on April 7.