visit hotnewss.com FREE to watch Chicago Half-Marathon Runner "Zachary Gregory" Dies During Steamy Saturday Race Zachary Gregory, a 26-year-old physical therapist, died on Saturday after participating in a half-marathon in the sweltering heat that day. The young runner was described by loved ones as in excellent health and physical fitness, and had been training for months for last weekend’s race, according to the Chicago Tribune. But the sudden onset of 90-degree weather and thick humidity may have been a shock to Gregory's system.