Featured here: https://www.facepunch.com/showthread.php?t=134245
Direct image here: https://img78.imageshack.us/img78/9982/zombierfx5.jpg
This was made by VALVe and was a final version of the zombie, but unfortunately, it was cut. I was wondering if it could be included in Black Mesa with a console command to toggle, like with the MP5.