Diane Martindale, co-artistic director and co-founder of the Dicapo Opera Theater, died on March 19 at the age of 87 of natural causes. Born on December 17, 1933, in Evansville, Indiana, Martindale received a master’s degree from Northwestern University in voice, piano, and opera, eventually making major productions of American operas and overseeing the artistic growth of the Dicapo Opera {…}