Мафия 4. The Smell of Money.

Investigators found only a thin purple stripe on the victim's neck, indicating that the killer managed to approach the victim unnoticed and strangle her.

The Lizard, by the way, has a double clue in his avatar: there are not only reins on the horse (a murder weapon?), but also the horse itself - in the form of a shadow (something that can easily sneak up unnoticed!). Let's keep him in mind just in case.

Added 6 minutes later
Although it's unlikely regarding the Lizard: the triad murder - ND #6, and the only ND explaining that someone came to his house afterward is ND #10 of the doctor. That's probably too much of a coincidence...