Mysterious Murders last location

[Drako]

For all of you who wants to know where to find the last location for this side mission:
you just need to go to Krasnaya Zarya's Quarry, wich is WAY up from the Polyot's Stadium or above and a little to the left from the Hospital.
The game wants us to search the whole map for this mission, dunno if it is a bug or just purposely done by the devs not adding a map marker for this. Either way, once you reach the Quarry, the journal will update