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• Acute myocarditis is related to a relevant number of sudden deaths. • Diagnosis is often performed post-mortem and on a forensic setting. • Eosinophilic myocarditis (EM) is a rare form of myocarditis. • Extensive myocardial sampling is mandatory for diagnosis of EM. • It's important to consider EM, although infrequent, facing with a sudden death. Acute myocarditis is related to a significant number of sudden deaths among young adults and its diagnosis is often demanded to post-mortem investigations performed on a forensic setting. Eosinophilic myocarditis (EM) is a rare form of myocarditis that is pathologically characterized by myocardial inflammation with eosinophils, often in association with elevated levels of circulating blood eosinophils. The sudden death of a 19-year-old boy with no past medical history is reported. Diagnosis of fatal acute EM was performed after a comprehensive investigation including an in-depth analysis of anamnestic and circumstantial data, and complete autopsy followed by toxicologic and cardio-pathological investigations. Discussion focuses on the forensic issues related to diagnosis and therapy of this rare form of acute myocarditis. As acute EM may be patchy, extensive myocardial sampling is mandatory in order to recognize the extent and the phase of the disease. An early diagnosis is the basis for a timely therapy, which is the key-point for prevent extensive myocardial damage, allowing a better outcome, especially when EM is acute and necrotizing. However, as demonstrated from the case herein reported, the course of EM is sometimes fulminant and does not allow any therapy nor even clinical diagnosis. Finally, this paper serves as reminder to consider this infrequent disease in differential diagnosis when facing with a sudden death, even in a young subject and in the absence of any prodrome. [ABSTRACT FROM AUTHOR]