The purpose of this observational study is to investigate whether myocardial scar characteristics assessed by cardiac magnetic resonance (CMR) can predict the risk of out-of-hospital sudden cardiac death (SCD) after myocardial infarction (MI). It aims to answer two primary questions: What is the association between CMR-assessed myocardial scar and post-MI SCD? Can we develop an imaging-clinical multimodal risk score for post-MI SCD? Participants included in this study had previously undergone CMR imaging during the stable phase following their MI as part of their prior clinical care. Prognostic data for these participants are collected through clinic visits and telephone follow-up.