This .asi plugin adds chalk outlines to corpses, just like in GTA 3/GTA VC

Installation:
Drag the .asi file to the root directory of the game or in the scripts directory (or through the mod loader)
Transfer the “models” folder contents to the “models” folder (or transfer the "models" folder to the root of the game)
Done!

Source code:
https://github.com/TheArtemMaps/BodyOutlinesSA/