After Salvatore Tessio is executed for betraying Michael, Neri is promoted to caporegime of Tessio's former crew, and plays a key role in the wave of murders that reestablishes the Corleones as the most powerful crime family in the nation. When Michael and his family move to Nevada, Neri becomes head of security for all hotels controlled by the Corleones. In the film version of The Godfather, Neri's backstory is not mentioned. He does not say a word in the first film and following Michael's return from exile in Sicily, Neri becomes his bodyguard, accompanying him everywhere.
Neri
Michael