Just catching up a bit.
Do we know for sure that the pond that the phones were retrieved from was located in the Park? Could it be outside the Park?
If the perp's route to the stated exit doesnt naturally pass a pond, has he really took the time post killing to detour to the Pond? To dispose of items? To clean himself down before leaving the park?
Is it possible that the phones were still pinging and its this that gave a location? Blood trail to pond?
What could the 'litter' be that makes it so much of a focus, to search for in dump? What is it that makes LE thing there is 'Litter' that could be important? How do they know it exists?
Was there A can/bottle/hipflask/flask possibly? The friend saying in the article that it was in nature to have not refused a stranger a drink.......How many crimes have started by ' do you have a drink please 'etc
Writing on paper?
Items of evidence from around the perimeter of park did I read? A 'Significant crime scene' . Obv scattered belongings.
More questions I know, just thinking IMO out loud..
The 'Litter is puzzling.
As is the rucksack. If perp has taken items then why leave rucksack?! How has he carried stuff? Has he rifled through rucksack at the scene, thus distributing 'litter' around the immediate scene that has then been blown around?