But why in this area?
He came by car.
Where from?
There is another park there I read. With more trees and bushes. Why not attack sb there?
I think it was Sabine he was obssessed with.
Could be a deranged stalker absolutely. But it could be he has a reason to be in the area like work, lots of people commute to work in London especially in the construction trade where your workplace is wherever the next project is. He probably felt more comfortable carrying out an attack in an area he is familiar with but is not too close to his actual home.