India, April 17 -- Tanner Horner is on trial after the former FedEx driver admitted to killing 7-year-old Texas girl, Athena Strand, after a delivery at her home. In the course of the hearing, audio was presented in front of the jury on Thursday, where Horner could be heard making threats to 'hurt' Strand if she tried to pull anything over him.

The disturbing nature of the clip prompted Elon Musk, the world's richest man, to call for Horner's immediate execution.

"Execute him immediately," Musk wrote in reply to a post which detailed the day in court. "During the trial today, jurors broke down in tears after audio footage was played of Horner killing Athena after he told her to take off her shirt and said she was 'really pretty.' Athena...