does he play any instrument?
Yes, guitar.
Jeff Hanneman
Hanneman's guitar work had a notable influence on heavy metal music and culture. 
what does still reigning refer to? A live performance DVD by the thrash metal band Slayer where was it performed? Augusta Civic Center which song did they sing? The song "Raining Blood" from the album "Reign in Blood". where was it recorded? Hit City West in Los Angeles. who wrote the song? Jeff Hanneman and Kerry King what music style did the former have? Hard rock
wiki:12300765
Jeff Hanneman [SEP] Legacy
Hanneman's guitar work had a notable influence on heavy metal music and culture. Musicians such as Robb Flynn (Machine Head), Dino Cazares (Fear Factory, Divine Heresy), Mille Petrozza (Kreator), Andreas Kisser (Sepultura), Dan Lilker (Anthrax, Nuclear Assault), Eric Hoffman (Amon/Deicide), Trevor Peres (Obituary), Mark Morton (Lamb of God) and Kelly Shaefer (Atheist) cited him as an influence on their playing and songwriting. Jeff Walker said that "Hanneman's playing and riff writing and attitude has had a big impact on Carcass". Shavo Odadjian declared that "without Jeff Hanneman, there would be no System of a Down". John Consterdine of "Terrorizer" magazine noted: "without Jeff Hanneman, Slayer certainly would not have created some of the most famous riffs in metal, which undoubtedly changed the entire genre".