Joyce Ann DeRoche Alexander     PORTLAND - Joyce Ann DeRoche Alexander, died on April 11, 2006 at Seaside Nursing Home.      She was born on Nov. 29, 1938 in Belfast.      She is survived by sons, Michael Alexander of Tallahassee, Fla. and John Alexander of Cocoa , Fla.; her sister, Geraldine DeRoche Spooner of Bucksport; her brother John DeRoche of Greenville, S.C.; granddaughters, Amber and Janna Alexander; great-grandson Jaiden Alexander; and several nieces and nephews.     A private service will be held in Cocoa, Fla., in mid-May.    Joyce Ann DeRoche Alexander