The Arsenal boss Arsene Wenger has said football managers should be punished if they argue with officials.
He was asked about the issue after Manchester United's Sir Alex Ferguson argued with a referee during a game on Boxing Day.
Ferguson wasn't punished for the incident but Wenger believes managers should face sanctions if they go overboard
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"All it takes is for somebody to see me - and I could just die, just like that. I could want to go to the shop and not come home."
Before the killing, Peters searched the internet for "serial killers", "treatment of child killers in prison" and "premeditated murder".
Arriva Rail North, Greater Anglia and South Western Railway are all affected.