From The Cressida Facebook:
Sad news. John Heyworth was found dead yesterday morning. More news as our son, Iain MacAonghais-Heyworth, checks with the police today in the town near Portland, Oregon where John lived. We really don't know anything yet. John was so excited about all the renewed interest in Cressida; we're very happy he knew about ...this group on Facebook. Iain McLennon, who is in this group along with my son and I, might also pass along the information. He's a dear friend of the family. We like to think that John has joined that wonderful band that includes his old friends George Harrison, John Lennon, Maurice Gibb, etc., etc., etc.His music will live on. Our son Iain is also a talented musician.