article_snippet: D'Agostino heir commits suicide .
article_snippet: Peter D'Agostino, 20, was found dead from a self-inflicted gunshot wound .
article_snippet: Peter D'Agostino, 20, was found dead from a self-inflicted gunshot wound.
article_snippet: Peter D'Agostino was the great-grandson of New York City supermarket chain founder Nicholas D'Agostino Sr.