Steven A. Cohen’s hedge fund SAC Capital has agreed to a $1.8 billion settlement with the Securities and Exchange Commission, and the deal is expected to include at least one guilty plea, reports Matthew Deluca and Patrick Rizzo for CNBC. The hedge fund has already paid $616 million of the total fee as part of a previous deal, but this is still the largest fine for insider trading in history. SAC Capital’s settlement with SEC Cohen himself is not a defendant in this case, but the settlement doesn’t protect him from civil or criminal prosecution related to the counts of…