If we assume that Pentangeli's suicide, Fredo's murder and Roth's murder occurred in rapid sequence (per Michael's admonition to Tom, "I don't want to kill everybody--just my enemies"), then all would have occurred in 1960: Roth told reporters at the airport that he came home to vote in the Presidential election.
Ntra la porta tua lu sangu � sparsu, E nun me mporta si ce muoru accisu... E s'iddu muoru e vaju mparadisu Si nun ce truovo a ttia, mancu ce trasu.
