AC/DC co-founder and guitarist Malcolm Young died Saturday according to an official statement posted on the pioneering rock band’s website. He was 64.

“As a guitarist, songwriter and visionary he was a perfectionist and a unique man,” read a statement that appeared to be written by Malcolm’s brother and fellow AC/DC co-founder Angus Young. “He always stuck to his guns and did and said exactly what he wanted. He took great pride in all that he endeavored. His loyalty to the fans was unsurpassed. As his brother it is hard to express in words what he has meant to me during my life, the bond we had was unique and very special. He leaves behind an enormous legacy that will live on forever.”

After Malcolm and Angus formed AC/DC in 1973, the Australian rock outfit continued touring until 2014. That year, the band announced Malcolm Young was “taking a break from the band due to ill health.” It was later revealed that Young was suffering from dementia.

During a career that spanned over 40 years, Malcolm Young’s contributions as a rhythm guitarist saw AC/DC win “Best Hard Rock Performance” at the 52nd Grammy Awards for the single “War Machine.” AC/DC was inducted into the Rock and Roll Hall of Fame in 2003. 

Per Billboard, AC/DC’s 1991 single “Moneytalks” enjoyed a 16-week run on the “Hot 100” chart while peaking at the No. 23 spot. Commercially, the 1980 album Back in Black likely cemented AC/DC’s spot as rock royalty. The album has the designation of being certified platinum 22 times by the RIAA.  

Former Megadeath drummer Shawn Drover was one of many to weigh in via Twitter and offer condolences.

R.I.P Malcolm Young from the mighty @acdc - Absolutely horrible news. #ACDC #Legend

— shawn drover (@shawndrover) November 18, 2017

Wow...just got off stage here in Brisbane Australia (of all places) to the shocking news of Malcolm Young's passing. So of the great rhythm guitar players of all time. (James Hetfield and Scott Ian would be the 1st to say so themselves...) #RIPMalcolmYoung

— Mike Portnoy 🤘 (@MikePortnoy) November 18, 2017

RIP Malcolm Young, co-founder Of the greatest Rock n Roll band ever.

— Gus G. (@gusgofficial) November 18, 2017

Malcolm Young is survived by his wife O’Linda and two children. According to CBS News, Young’s family said he passed away peacefully Saturday with his family at his bedside.