Indiana prosecutors will not file criminal charges in the death of a 75-year-old Tim Hortons customer who suffered a fatal heart failure episode following a violent confrontation with a store manager. Investigators said Grayson entered the shop shortly after 8 a.m. and confronted a 17-year-old employee over her order. The exchange escalated quickly enough that a 20-year-old shift manager stepped between Grayson and the teenage worker. “The symptoms of congestive heart failure get worse when there is adrenaline flowing in a physical altercation, and then a sudden flare-up of the heart failure, which then can lead to symptoms, or hospitalization, and even death,” the coroner said. “After exhaustive review, we could not determine with reasonable certainty that Mrs. Grayson’s death was either natural, or homicide, or accident.