One of the three people killed in an air ambulance crash in the Chicago area Monday died of a heart attack, not injuries from the crash, The Chicago Tribune reported Thursday. http://www.chicagotribune.com/news/local/breaking/chi-autopsy-finds-patient-on-plane-died-of-heart-attack-not-crash-20111201,0,2795634.story An autopsy found that John Bialek’s cause of death was coronary artherosclerosis,…