It seems like all I’ve done over the last week or so is post obituaries, but, sadly, people who are important in the folk world just keep dying and nothing I can do can stop that. The most recent one is Tim Hart, member of Steeleye Span. Hart, who also recorded with Maddy Prior, was 61 when he died of lung cancer on December 24. Steeleye Span is the group that grew up around Ashley Hutchings after he left Fairport Convention and is one of the seminal UK folk/rock groups of the last 40 years.
I looked for a news release or obit in a major publication, but this is the only one that came up. Apparently there is no official website for Tim Hart or Steeleye Span, so here are some wikipedia links.
Edit: Some good resources and links in the comments. Make sure you read them to get more information.

