I think it could go either way.

In one scenario, Connie was completely innocent and just followed Michael's order to bring in Anthony from the boat because he's in charge. She was never really deep inside of the family business at that point, and she would have no reason to have detailed knowledge about why Michael would go to the length of killing Fredo.

In the other scenario, Connie's character has clearly transformed from the first film from a passionate newly wed to more of a resigned sister to Michael. Her bitterness and distance from Fredo causes her to go along with Michael's wishes to kill him and she doesn't interfere, taking Michael's side... To add to this, we learn that Kay knows about Michael killing Fredo. I can easily imagine her and Connie sharing thoughts...


Francis Ford Coppola cleverly skipped over the aftermath of Fredo's death and funeral, leaving everyone to guess how many people actually did know the truth about Fredo's death. In my personal opinion, Connie did know and just acted out of pity for Michael so that he wouldn't have to bear the full weight of his sins when he was trying to come clean.