Mo Farah has sacrificed spending time with his family to concentrate on training. At one point he was spending so much time away, that one of his daughters didn't even recognise him.
Farah said: "She didn't recognise me. Now she's getting to know me a bit better. I've been giving her sweets and chocolate, kind of bribing her a bit!"
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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.