Founding member of rock band AC/DC Malcolm Young has died peacfully in his sleep.
The band announced his death on its official Facebook page and website Saturday.
Young was diagnosed with dementia in 2014, the band has not released an official time of death, or where Young was at the time of his death.
He helped pen some of the greatest hard-rock riffs in music history in Highway to Hell, Hells Bells and Back in Black.
Young was 64 years old.