(I'm bearing in mind the fruit shown in 'photo 2.JPG')
(The fruit and leaves are not right for Prunus avium.)
This species is often seen as a purple leaved cultivar, such as 'Atropurpurea', 'Pissardii', or '
'Nigra'. In a garden, it would be unusual to see the plain species.
But it is often used as a rootstock (eg. P. c. 29C), onto which selected cultivars are grafted. If not properly managed, it is possible for shoots from the rootstock to take-over a tree, completely supressing the cultivar. I wonder if that has happened in this case. Bear in mind the rootstock may go up to head height, the grafting being done at that level.