Tanner Horner pleaded guilty to capital murder after his trial began for the killing of seven-year-old Athena Strand in Texas.The former FedEx driver admitted to strangling the child in his delivery van during a panic following an accident while dropping off gifts.Security footage and forensic DNA evidence presented during the hearing contradicted his claims and suggested a violent abduction occurred.Jurors will now determine whether the defendant receives the death penalty or a sentence of life imprisonment without the possibility of parole.