Vincent asks permission to retaliate and Michael tacitly agrees, then formally retires as Don and names Vincent his successor, instructing him to call himself Don Vincent Corleone. Michael's guidance has made Vincent into a better man - patient, responsible, and wise. His first act is to order the murders of Lucchesi, Keinszig, and Gilday. Connie kills Altobello (her godfather) by poisoning him. In return for being made Don, Vincent agrees to end his relationship with Mary. That same night, Altobello's assassin Mosca accidentally kills Mary during an attempt on Michael's life, and Vincent kills Mosca with a single gunshot. He looks on, devastated, as Michael cradles Mary’s dead body.
