Dean worked as a dishwasher at a restaurant. Vinny, one of the line cooks, often teased Dean about his relatively lower status, which infuriated Dean. One day, Vinny called Dean a "douche washer," and Dean told Vinny if he said one more thing Dean was going to lose it. Vinny called him a douche washer again, and Dean reached for a kitchen knife that was hanging on the wall and plunged it into Vinny's chest, killing him.

Discuss Dean's criminal liability for the death of Vinny