NEW YORK (AP) — Malcolm Young has left AC/DC.
A statement Wednesday from the band's label said: "Unfortunately, due to the nature of Malcolm's condition, he will not be returning to the band."
No details were provided.
The band announced in April that the 61-year-old guitarist was taking a break to focus on his health.
AC/DC will release the album "Rock or Bust" on Dec. 2. They will launch a world tour next year.
Stevie Young, nephew of founding members Malcolm and Angus Young, played guitar on the band's new album and will join them on the tour.
AC/DC includes vocalist Brian Johnson, drummer Phil Rudd and bassist Cliff Williams. Young has performed with AC/DC for 40 years.