In Metal Gear Solid 3: Snake Eater, Sokolov was killed during an interrogation by Volgin.
Kirill Sokolov died in 2004.
Georgi Sokolov died in 2001.
Yuri Sokolov died in 1941.
Arseny Sokolov died on 1986-10-19.
Nikolay Sokolov - composer - died in 1922.
Victor Sokolov died on March 12, 2006 at the age of 59.
Alexander Ivanovich Sokolov died on 1973-05-09.
Pyotr Petrovich Sokolov - painter - died in 1899.
Ivan Sokolov-Mikitov died on 1975-02-20.
If one is referring to the games, Metal Gear was the first Metal Gear game. It was released in 1987 for the MSX2 computer and the Nintendo Entertainment System by Konami. If one is referring to the eponymous Metal Gear mecha, the first one in the series chronology was the Metal Gear TX-55, designed by Dr. Madnar in Outer Heaven in 1995. Prior to the TX-55, there was the Shagohod, as created by Soviet scientist Dr. Sokolov in 1964. This was not a Metal Gear in the traditional sense, as it lacked legs and instead used hovercraft technology and jet propulsion. But it was made to deliver a nuclear payload from any location in the world. However, the original designs for Metal Gear, as imagined by Aleksandr Granin, bore a resemblance to Metal Gear REX and Metal Gear D, although those would not be realized until 2005 and 1998 in the games' chronology, respectively.
Solid Snake doesn't die in Metal Gear Solid 4, and he will not be in Metal Gear Solid 5 There will not be a metal gear solid 5 as i read an exlusive interview with Hideo Kojima where he said there will not be a metal gear solid 5 instead they will make spin offs
A Metal Gear is a bipedal nuclear tank which features in most of the Metal Gear games. The first made Metal Gear is Metal Gear Raxa which was known as an ICBMG, then there was Metal Gear TX-55 and Metal Gear D. The next Metal Gears were Metal Gear Rex and Metal Gear Ray. After those they finally perfected the Metal Gears and made what is codenamed Metal Gear Gekko.