UPDATE: 12/11/12, 10:20 a.m. EST. The names of the lawyers from Willkie advising longtime client SAC Capital have been added to the third and fourth paragraphs of this story.

A month after agreeing to a $1.8 billion settlement on insider trading charges, hedge fund billionaire Steven Cohen’s SAC Capital Advisors has agreed to sell its SAC Re reinsurance arm to an investor group led by former Marsh & McLennan CEO Brian Duperreault.