Tim Smith of "Cardiacs" fame. I've got no details yet, but I'm floored by this news.
This was my favourite band as a teenager and through my 20s. Followed them live when they played the Midlands. Worked with their lighting engineer for some gigs (for free!) for a while in the late 80s. Tim always seemed a quiet, polite and unassuming bloke off stage and a mad fucking monster on it.
I'm seriously gutted. He really was one of a kind.