It is not clear if people with diabetes but no heart attack in the past have the same chance of getting heart disease as non-diabetic individuals who did have a heart attack. Our research focused on examining the probability of developing heart disease and stroke, as well as evaluating the likelihood of mortality resulting from heart disease, among individuals with and without diabetes who had previously experienced a heart attack. The main aim of the study is to understand and examine ST-segment elevation myocardial infarction (STEMI) in people with diabetes and those without diabetes and to compare indications of STEMI in patients with and without diabetes. Additionally, 160 people with diabetes, as well as non-diabetic patients, were studied using the methods utilized in this study. The research was done over the course of 18 months by investigating the various tests such as electrocardiogram, cardiac markers, blood-sugar level and glycosylated haemoglobin (HbA1c). Results of this study involved 160 individuals, 80 of whom were non-diabetes and 80 of whom were diabetics. There were 101 men and 59 females among the 160 patients that participated in this study. Conclusion is that the Non-diabetic individuals who had a MI history had a greater risk of CHD events and cardiovascular death in comparison to diabetic individuals without a history of heart attack (MI). However, both groups had a similar risk of stroke.