During her career at the Met, Chookasian sang with many great singers like Carlo Bergonzi, Richard Cassilly, Franco Corelli, Phyllis Curtin, Mattiwilda Dobbs, William Dooley, Plácido Domingo, Reri Grist, Anna Moffo, Birgit Nilsson, Leontyne Price, Gail Robinson, Leonie Rysanek, Joan Sutherland, Renata Tebaldi, and Richard Tucker among others. In 1984, during a performance of "Rise and Fall of the City of Mahagonny", she suffered a minor heart attack on stage and was unable to continue the performance. After this her performance career slowed down somewhat and her last performance at the Met was on February 17, 1986 as Gertrude in Gounod's "Roméo et Juliette" with Neil Shicoff as Roméo and Catherine Malfitano as Juliette. Her 290th performance with the company, was also her farewell to the opera stage.