Is there somebody who knows the sad Song in the Backround?

Its instrumental /piano I guess.
the First time, its on the Scene: when the Killer is hearing his music, walk through a Park and remember a girl which walking by. The second Time is, when the ?Shaman? lay in Hospital (Warning! Spoiler> and died).

its such a beautiful Song but I cant find them. It is NOT a Part of the official OST. (Ive heard every Song which Youtube found from Suspicious Partner it isnt there!)
Shazam could not find it.

Its similar to Songs from Thomas Newman ("Road to Perdition" or something like that)

Im very desperate.