Metal Gear Solid 2 (Sons of Liberty)
Liquid Snake's influence did not stop with his death. Liquid managed to posthumously take control of former ally Revolver Ocelot (via the transplant of the right arm that once belonged to Liquid) during Ocelot's heist of the Metal Gear RAY prototype in 2007. This awakening was due to Snake's presence, and supposdedly Ocelot's father having been the Sorrow, thus giving him powers to communicate with the deads.
Two years later, he anonymously tipped off Solid Snake and Otacon about the events unfolding at the Big Shell, as he knew he could only take full control of Revolver Ocelot in Snake's presence. Following Arsenal Gear's take-off, he took full control, stole RAY and escaped in search of the Patriots.
In addition, Liquid's corpse was stolen by Snake after the Tanker Incident in an attempt to fake his own death. After examining the body, Rosemary confirmed that the DNA matched that of Solid Snake, seemingly confirming his death to Raiden.