The 58-year-old Irish rocker, recognized to be one of the best blues-based guitarists of the 70s, died while vacationing in Costa del Sol, according to his official website. The cause of death is yet to be determined.
"I still can't believe it," ex-Lizzy guitarist Eric Bell told the Belfast Telegraph. "He was so robust, he wasn't a rock casualty; he was a healthy guy. He was a superb player and a dedicated musician."
He was a full time member of the band when they recorded the album, "Black Rose: A Rock Legend," which topped the charts in 1979 and debuted at #2 in the United Kingdom.
Moore also continued to have a successful solo career but will be best known for his ripping guitar riffs on Thin Lizzy hits like "The Boys are Back in Town" and "Parisienne Walkways."