Today, the son of Rosemary Shearman described the moment he found out his mother's death, and appealed for anyone with information to come forward. Greg Shearman said:
"It was unreal, it's not the sort of thing that happens to your own family. But laying flowers at her house for myself and my sister - was just terrible.
"If anyone was in that area, and may have seen something, just contact the police. This is a nan, my mum, who's been taken away from us. And it's wrong. If you can help, ring the police."
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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.