I am trying to find a sci-fi short story I read in early 2010s. The story took place in a futuristic setting on Earth, where highly realistic virtual reality was developed. People could connect into one of several virtual reality worlds, where they appeared as customizable avatars. The most popular virtual worlds were post-apocalyptic versions of real-world cities like New York, Tokyo etc. Since injuries in VR had no consequences in real world, I think some parts of the VR were quite violent.
The main character (who was I think a detective) had to investigate murder of a young woman. The victim was a frequent user of virtual reality and I think her body was found in a business that provided its clients with interfaces for connecting to virtual reality. I also think that the victim might have been addicted, either to the virtual reality itself or to some dangerous drug (or possibly both).
During the investigation, the main character had to go into virtual reality and visit one of the virtual worlds, which I think was the post-apocalyptic New York City, the victim frequented. There he talked to someone with a rather strange avatar that looked like a humanoid, but among other things had a skin made out of silver (or some other precious metal). I also think that when he was inside the virtual reality, the main character got involved in a violent clash with other users and was helped by someone, possibly the user with the weird avatar. I don't remember the exact ending, but I have a feeling the killer was eventually discovered.
I read it around 2010-2015. I read the story in Czech language, but I am pretty sure it was a translation of a foreign author (likely an American). It was probably in a sci-fi short story collection with other stories about virtual reality, artificial intelligence, etc. Although I might have also read it in the XB-1 (formerly Ikarie) magazine I used to read around that time, which also features translated stories (mostly from English). However, I browsed through several editions from that time and so far I did not find anything like the story I remember. Unfortunately, I am unsure about the original publication date of the story. It is definitely not newer than say 2015, but it might have been much older.