Charles, and grandparents, Frances and Michael Quattrocchi.
Gus was wounded in the stomach with a bullet during a very mysterious affray. He was taken to City Hospital and passed at 3:40 a.m. on April 19. He never mentioned how or why he became a victim, nor did he reveal who might have committed this crime.
The image of his death certificate can be found on the Missouri Digital Heritage site :
His cousin, James Russo, was the person who had taken him to the hospital. James also reported another story which did not match any information that young Gus had relayed. The police went to the site of the shooting where they found a large pool of blood, in addition to two caps and two bullet holes in a nearby fence. The location was by the home of James Russo.
James Russo was the brother of "Shorty" Russo, a black hand mobster believed to have murdered a man just three days prior to the death of young Gus. An accomplice of his was Vincent Spicuzza, also believed to have been dabbling in the black hand business.
The St. Louis Post-Dispatch covered the story in a short three paragraph article on April 19, 1924.
As of yet, I have not found the names of the men who slayed young Gus Rizzo. If you have any further information on this case, please add it to the comments section.