The rocker co-wrote several of Whitesnake's biggest hits, including "Is This Love" and "Still of the Night." John Sykes, the electrifying guitarist who rocked the world in legendary bands Whitesnake and Thin Lizzy,

John Sykes, guitarist with Whitesnake and Thin Lizzy who co-wrote the hit singles 'Still of the Night' and 'Is This Love,' has died. He was 65.

Yesterday (January 20), it was announced that John Sykes – a hugely influential mainstay of '80s hard rock guitar who had stints in Whitesnake, Thin Lizzy, and Tygers of Pan Tang – had died at 65.