Summit County Coroner Joanne Richardson responded late Thursday afternoon to an apparent heart attack victim at Breckenridge Ski Resort.Gregg Simmons, 50, was found on the Spitfire Trail, a black run on Peak 10, in cardiac arrest. Simmons, a Denver resident, was here for the day skiing with his son, according to Richardson.In the report, the coroner wrote, “There was no apparent trauma. It manner appears to be from natural causes but an autopsy has been ordered.”No additional information is available at this time.