John Renbourn (The Pentangle, The John Renbourn Group, etc.) passed away presumably from a heart attack. After failing to appear at a gig on Wednesday night at the Ferry club in Glasgow, the police found him dead in his house at Hawick.
For anyone who wishes to check his work, John Renbourn - The Lady and the Unicorn, The John Renbourn Group - A Maid in Bedlam and The Pentangle - Basket of Light is a great start.