Mark Sizemore, 73, died in his sleep at Haines Assisted Living on June 20. He had been ill several years from side effects of treatments that cured throat cancer in 1998. He and wife Joan Sizemore volunteered at the finish line of the Kluane Chilkat International Bike Relay earlier that week. He was a fan of “Please Don’t Bury Me” by John Prine and the lyrics sum up his last wishes. “Throw my brain in…