<P> Though Hagen immerses himself in the Sicilian - American lifestyle, and speaks Sicilian, he has a "non-Italian" physical appearance . His Northern European appearance is advantageous to his work, allowing him to travel and conduct family business openly without potential witnesses remembering him . </P> <P> While Hagen loves all the Corleones, he idolizes Sonny, and blames himself for Sonny's murder . When Vito semi-retires in 1954, and his youngest son, Michael, succeeds him as the operating head of the family, Michael removes Hagen as consigliere, preferring his father informally assume the role; Michael claims Hagen is not a "war - time" consigliere . Hagen is thus restricted to handling the family's legitimate business . </P> <P> The novel and first film portray Hagen aiding Vito and Michael Corleone in warring against the other ruling New York Mafia families . In The Godfather Part II, set in the late 1950s, Hagen serves as Michael's right - hand man during his power struggle with Hyman Roth . In The Godfather Part III, set in 1979 - 1980, he is said to have died some years before in an unspecified manner . His role in the story between the second and third films, including his death, is portrayed in Mark Winegardner's sequel novels, The Godfather Returns and The Godfather's Revenge . </P> <P> In both the novel and film, Hagen is introduced as an important member of the Corleone family . As a child he grew up in a broken family, the son of an abusive alcoholic . Sonny Corleone finds the orphaned Hagen living on the street and suffering from a bad eye infection . Sonny takes him home and demands he live with the Corleone family . Vito Corleone becomes a surrogate father to Hagen, but never officially adopts him out of respect for the boy's father . </P>

What happens to tom hagen in godfather 3
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