Question: The Godfather's Revenge includes a plot that implicates which Robert Duvall-played character in a murder?

Context paragraphs:
Danny Shea (The Godfather): Daniel Brendan 'Danny' Shea is a fictional character in Mark Winegardner's novels "The Godfather Returns" and "The Godfather's Revenge".  He is based on Attorney General and US Senator Robert F. Kennedy.

The Godfather's Revenge: The Godfather's Revenge, a 2006 novel written by author Mark Winegardner, is the sequel to "The Godfather", "The Sicilian", and "The Godfather Returns".  The story takes place from 1963–1964, and picks up the story from where "The Godfather Returns" left off.  The novel deals with Michael Corleone's guilt over the events of "The Godfather Part II", particularly his ordering the death of his brother, Fredo.  Subplots include Nick Geraci's plans for revenge against the Corleones, Tom Hagen's being implicated in a murder, and organized crime's battle with a presidential family (the Sheas, who are analogous to the Kennedy family).

Salvatore Tessio: Salvatore "Sal" Tessio is a fictional character in Mario Puzo's 1969 novel "The Godfather", as well as two of the films based on it: "The Godfather" and "The Godfather Part II" (1974).  His given name was created for the films; in the novel he is referred to only as "Tessio".  In the film "The Godfather", Tessio was portrayed by Abe Vigoda.  In "The Godfather Part II", John Aprea portrayed the younger Tessio, while Vigoda reprised the role in a flashback, set in late 1941, at the end of the film.

Le Chevalier de Maison-Rouge: Le Chevalier de Maison-Rouge (translated as "The Knight of Maison-Rouge: A Novel of Marie Antoinette" or "The Knight of the Red House") was written in 1845 by Alexandre Dumas, père.  It is related to a series referred to as the Marie Antoinette romances, though technically not part of that series as the characters of Joseph Balsamo (also known as Cagliostro) and Doctor Gilbert do not appear in the novel, and many of the other series protagonists have died by the start of this novel.  The novel takes place shortly after the end of the series, following the death of Louis XVI.  Set in Paris during the Reign of Terror, the novel follows the adventures of a brave young man named Maurice Lindey who unwittingly implicates himself in a Royalist plot to rescue Marie Antoinette from prison.  Maurice is devoted to the Republican cause, but his infatuation with a beautiful young woman leads him into the service of the mysterious Knight of Maison-Rouge, the mastermind behind the plot.

Ritchie Nobilio: Richard Anthony "Ritchie" Nobilio, Jr. is a fictional character in the novels "The Godfather Returns" and "The Godfather's Revenge".

Vito Corleone: Vito Corleone is a fictional character in Mario Puzo's novel "The Godfather" and in the first two of Francis Ford Coppola's three Godfather films, in which he was portrayed by Marlon Brando in "The Godfather" and then, as a young man, by Robert De Niro in "The Godfather Part II".  He is an orphaned Sicilian immigrant who builds a mafia empire.  Upon his death, Michael, his youngest son, succeeds him as the mafia don of the Corleone crime family.

Tom Hagen: Tom Hagen is a fictional character in Mario Puzo's novel "Godfather" and Francis Ford Coppola's films "The Godfather" and "The Godfather Part II".  He was portrayed by Robert Duvall in the films.

Laertes (Hamlet): Laertes is a character in William Shakespeare's play "Hamlet".  His name is taken from the father of Odysseus in Homer's Odyssey.  Laertes is the son of Polonius and the brother of Ophelia.  In the final scene, he kills Hamlet with a poisoned sword to avenge the deaths of his father and sister, for which he blamed Hamlet.  While dying of the same poison, he implicates King Claudius.  The Laertes character is thought to be originated by Shakespeare, as there is no equivalent character in any of the known sources for the play.

Tommy Neri: Thomas 'Tommy' Neri is a fictional character in the novels "The Godfather, The Godfather Returns", and "The Godfather's Revenge".

Mark Winegardner: Mark Winegardner (born November 24, 1961) is an American writer born and raised in Bryan, Ohio.  His novels include "The Godfather Returns", "Crooked River Burning", and "The Veracruz Blues".  He published a collection of short stories, "That's True of Everybody", in 2002.  His newest novel, "The Godfather's Revenge", was published in November 2006 by Putnam.  His "Godfather" novels continue the story of the Corleone family depicted in Mario Puzo's "The Godfather".

Supporting paragraphs: The Godfather's Revenge Tom Hagen
Answer: Tom Hagen