A petition with over 21,000 signatures opposing plans to close Lewisham's Accident and Emergency Department will be handed in to Downing Street later.
Protestors have demonstrated against the closure in recent weeks.
The MP for Lewisham East, Heidi Alexander, will join doctors and consultants to deliver the document and other letters.
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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.