Sad news, though given that in recent years he had dementia, lung cancer and had to have a pacemaker fitted, it may well have come as a relief.
Although Angus is the more recognisable Young, with the schoolboy uniform, duckwalk, guitar solos etc, Malcolm was, as I’m sure most of you know, the real songwriter and general powerhouse behind AC/DC. By all accounts he was quite the perfectionist, which is probably how he came to be one of the most acclaimed and influential rhythm guitar players in rock. While nephew Stevie Young did a good job on recreating his sound on the last album and tour, it’s bard to imagine how the band can continue without Malcolm.
RIP Malcolm and thanks for the memories.