UpdatedThu, Jan 7, 2021 at 1:47 pm CT Reply(1) The most deaths in a single day in Arlington Heights since the start of the outbreak was six on May 23. (Carly Baldwin/Patch) ARLINGTON HEIGHTS, IL — Like every other municipality in Illinois, Arlington Heights has been dealing with its own unique data points regarding the coronavirus. According to the Cook County Medical Examiner, 105 people have died due to COVID-19 in Arlington Heights since April 8. That marks seven new deaths since our last report on Dec. 31, 2020. For further comparison, there was one additional death between Dec. 24-31. The most deaths in a single day since the start of the outbreak was six on May 23.