Question: When did the star of the unreleased Super Nintendo Entertainment System game, Socks the Cat Rocks the Hill, pass away?

Context paragraphs:
Socks (cat): Socks Clinton (Spring 1989 – February 20, 2009) was the pet cat of U.S. President Bill Clinton's family during his presidency.  As an adopted stray cat, he was the only pet of the Clintons during the early years of the administration, and his likeness hosted the children's version of the White House website.  After Clinton left office, Socks resided with former Clinton secretary Betty Currie and her husband, owing to continuing conflicts with Clinton's dog Buddy.

Acclaim Entertainment: Acclaim Entertainment, Inc. was an American video game developer and publisher.  It developed, published, marketed and distributed interactive entertainment software for a variety of hardware platforms, including Sega Genesis, Sega Saturn, Dreamcast, and Game Gear, Nintendo Entertainment System, Super Nintendo Entertainment System, Nintendo 64, GameCube, Game Boy, Game Boy Color, and Game Boy Advance, PlayStation and PlayStation 2, Xbox, Microsoft Windows systems and arcade games.  They also released video games for the Master System in Europe.

Nintendo Entertainment System: The Nintendo Entertainment System (commonly abbreviated as NES) is an 8-bit home video game console that was developed and manufactured by Nintendo.  It was initially released in Japan as the Family Computer (Japanese: ファミリーコンピュータ , Hepburn: Famirī Konpyūta ) (also known by the portmanteau abbreviation Famicom (ファミコン , Famikon ) and abbreviated as FC) on July 15, 1983, and was later released in North America during 1985, in Europe during 1986 and 1987, and Australia in 1987.  In South Korea, it was known as the Hyundai Comboy (현대 컴보이 "Hyeondae Keomboi") and was distributed by SK Hynix which then was known as Hyundai Electronics.  The best-selling gaming console of its time, the NES helped revitalize the US video game industry following the video game crash of 1983.  With the NES, Nintendo introduced a now-standard business model of licensing third-party developers, authorizing them to produce and distribute titles for Nintendo's platform.  It was succeeded by the Super Nintendo Entertainment System.

Amy Hennig: Amy Hennig (born August 19, 1964) is an American video game director and script writer, formerly for the video game company Naughty Dog.  She began her work in the industry on the Nintendo Entertainment System, with her design debut on the Super Nintendo Entertainment System game "".  She later went to work for Crystal Dynamics, working primarily on the "Legacy of Kain" series (her self-proclaimed greatest achievement).  With Naughty Dog, her work has been on two primary series: "Jak and Daxter" and "Uncharted".

Electro Brain: Electro Brain was a United States video game company.  They brought over "" for the Nintendo 64, as well as published games like "Go!  Go!  Tank", on the Nintendo Game Boy, "Super Cars" and "Ghoul School" for the Nintendo Entertainment System, "Vortex" and "Jim Power: Lost Dimension in 3D" for the Super Nintendo Entertainment System, and "Brain Battler", "Brain Bender", "Daffy Duck: Fowl Play", "Go!  Go!  Tank and Kingdom Crusade" for the Game Boy and Game Boy Color.  They only developed one game, Trax, a side scrolling shooting game, on the Nintendo Game Boy in 1991.  In 1998, Electro Brain filed for bankruptcy and closed down after the company published their last two games, which were on the Nintendo 64, Star Soldier: Vanishing Earth, and Dual Heroes, that failed to gain revenue for the unsuccessful company.

List of Yoshi video games: The Yoshi video game series is a franchise of platform games and puzzle games that is a spin-off of the "Mario" series published and produced by the Japanese gaming company Nintendo.  The games have been developed by a variety of developers including Nintendo, Game Freak, Intelligent Systems, Artoon, Arzest, and Good-Feel.  "Yoshi" games have been released for Nintendo video game consoles and handhelds dating from the Nintendo Entertainment System (NES) to the current generation of video game consoles.  Some of the original Nintendo Entertainment System and Super Nintendo Entertainment System games have been ported to Game Boy Advance or the Virtual Console (both, in the case of "Super Mario World").

Socks the Cat Rocks the Hill: Socks the Cat Rocks the Hill is an unreleased platform video game developed by Realtime Associates for the Super Nintendo Entertainment System.  The game stars Socks, the real life presidential pet of the Clinton family during Bill Clinton's tenure in office.  Originally scheduled for release in the fall of 1993, "Socks the Cat" experienced delays until it was ultimately canceled due to the closure of publisher Kaneko's U.S. branch in the summer of 1994.  The game was complete however, and review copies were still distributed to gaming publications.  A prototype cartridge has entered the hands of private collectors, but the ROM image has not been released to the public.  A Kickstarter campaign to fund a relaunch of the game was successfully funded and anticipates a 2017 release.

Super Mario All-Stars: Super Mario All-Stars is a 1993 compilation of "Super Mario" platform video games developed and published by Nintendo for the Super Nintendo Entertainment System.  The game contains enhanced remakes of the four "Super Mario" games released for the Nintendo Entertainment System: "Super Mario Bros.", "Super Mario Bros. 2", "Super Mario Bros. 3", and "", the latter of which was the original Japanese version of "Super Mario Bros. 2" which was never released outside Japan prior to this compilation.  The games were restructured to take advantage of the Super NES hardware, featuring updated graphics and sounds and additional save mechanisms.

Super NES Classic Edition: Super Nintendo Entertainment System: Super NES Classic Edition, known as Nintendo Classic Mini: Super Nintendo Entertainment System in Europe and Australia and the Nintendo Classic Mini: Super Famicom (Japanese: ニンテンドークラシックミニ スーパーファミコン ) in Japan, is a dedicated video game console by Nintendo, which emulates the Super Nintendo Entertainment System.  The console, a successor to the NES Classic Edition, comes with twenty-one Super NES titles pre-installed, including the never-before-released game "Star Fox 2".  It was released on the 21st anniversary of the Nintendo 64's release in North America.

List of Nintendo Entertainment System games: A total of 714 known licensed game titles were released for the Nintendo Entertainment System video game console during its life span, 679 of these games released in North America, with an additional 35 released in Europe or Australia.  This list does not feature unlicensed NES games.  The Nintendo Entertainment System (NES) — renamed from the Family Computer, or Famicom — was first released in North America on  18, 1985 (1985--) .  The NES was released in Europe and Australia in late 1986 and distributed by various third-party companies until Nintendo took over distribution in 1990.  The final licensed NES game released was the PAL-exclusive "The Lion King" in 1995, while the most recent unlicensed (homebrew) game released was "Sydney Hunter and the Curse of the Mayans" in 2017.  The NES was succeeded by the Super Nintendo Entertainment System, released in 1991.

Supporting paragraphs: Socks the Cat Rocks the Hill Socks (cat)
Answer: February 20, 2009