Killer FedEx driver Tanner Horner snorted a line of cocaine when his attempt to strangle 7-year-old Athena Strand failed, before he beat her to death, a psychiatrist testified at his murder trial Wednesday.

“He tried to kill her by breaking her neck. Then he choked her,” Dr. Eileen Ryan, a psychiatrist who heard Horner’s own description of his gruesome crimes, told the jury.

Killer FedEx driver Tanner Horner snorted a line of cocaine when his attempt to strangle 7-year-old Athena Strand failed, before he beat her to death. FOX 4 DFW

“She was still alive after he choked her. He could hear her breathing.…