Police are searching for a 55-year-old man after a man is his 60s was found murdered in Berkhamsted.
Officers have released an image of Ian John McLoughlin, the man they would like to talk to, who is also known as Ian John Baker.
The victim was found dead at an address on Nettleden Road on Saturday afternoon.
A second man in his 80s has been taken to hospital with injuries that are not believed to be life threatening.
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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.