"It's Edith O'Brien who's asking for the case's first immunity agreement. The New York Times reports that the FBI has named O'Brien "a person of interest" in the investigation, and she's reportedly the person who pulled the trigger on a $200 million transfer of customer funds to JP Morgan Chase on the eve of MF Global's bankruptcy. "Authorities had expected to interview Ms. O’Brien last month," The New York Times' Dealbook reported late last night. "She instead balked at meeting voluntarily, asking first to strike a deal with criminal authorities that would excuse her from prosecution, the people said." Though The Times is quick to note that being named "a person of interest" doesn't indicate guilt, her request for an immunity agreement--seems to indicate that O'Brien is holding on to some pertinent information and that she might very well be on the verge of cracking."