Runner in 13.1 Chicago half-marathon dies; race stopped "black flag" because of heat, humidity

chicagobreakingnews.com Zachary Gregory transported from 7500 block of S. South Shore Drive ... Official race website 131marathon.com ... Weather when race started at 7:13 a.m. under a yellow flag, and when it was put at red flag at 8:51 a.m. 82.0 °F/69% humidity, and at black flag at 9:15 a.m. ... arlingtoncardinal.com MAP/SAT view where Zachary Gregory collapsed ...