Kat & Roman Kostrzewski ("Kat & RK") was a Polish thrash metal band formed by Roman Kostrzewski and Ireneusz Loth after they had left their original band KAT in 2004. Most of the fanbase of KAT views Kat & Roman Kostrzewski as its rightful successor, mainly due to the characteristic vocals of Roman, his lyrics and choice to sing in Polish as in most of KAT's original albums. Since 2004 the group has toured extensively through Poland, while composing material for their first album Biało-czarna" (White-and-black), which was released in April 2011 by Mystic Production. The first samples off the new album were released in late 2010. On February 10, 2022, Roman Kostrzewski died from cancer at the age of 61. Band members Final lineup Roman Kostrzewski – vocals Michał Laksa – bass Krzysztof "Pistolet" Pistelok – guitar Jacek Hiro – guitar Jacek Nowak – drums Former members Ireneusz Loth – drums Piotr Radecki – guitar Waldemar "Valdi" Moder – guitar Paweł "Bajtel" Pasek – guitar Live members Krzysztof "Fazi" Oset – bass Jarosław Niemiec – bass Session musicians Piotr "Pienał" Pęczek – drums Discography Studio albums Video albums References 2004 establishments in Poland 2022 disestablishments in Poland Polish thrash metal musical groups Mystic Production artists Musical quintets Musical groups established in 2004 Musical groups disestablished in 2022