article_snippet: Peter D'Agostino, 20, pictured, was found dead from a self-inflicted gunshot wound last year .
article_snippet: Peter D'Agostino heir takes D'Agostino heir life .
article_snippet: Peter D'Agostino, 20, was found dead from a self-inflicted gunshot wound.
article_snippet: a 20-year-old student and heir to New York City supermarket fortune was the great-grandson of New York City supermarket chain founder Nicholas D'Agostino Sr.