A Cook County jury rendered a defense verdict in favor of the Des Plaines Park District after a 28-year-old woman died from a cardiac event while working out at its facility.A verdict was reached Oct. 23 after a two-week trial before Circuit Judge Thomas J. Lipscomb.In December 2015, medical student Alexandra Frunza, 28, was working out on an exercise machine at the park district’s Prairie Lakes Fitness Center when she …