The madman and murderer is not Nathaniel (The Witcher 3: Wild Hunt)

I think many people remember the quest with Ppisscyla and the attack on her. Well, we caught the wrong one. Just walked through the streets of Novigrad and stumbled upon a new victim, Geralt himself said this. Not far from the tavern "Nowhere".
But nothing was added to the log. If you went further, this quest can be completed to the end, for example, go to the doctor. The problem is, I don't remember where it is.

Updated:
I found a doctor, he says that you need to protect loved ones and be careful, the crime scene has been cleaned. But I suspect it was him, even at first I thought it was him. The quest is not added to the Journal.