Fannie Mae is terminating its long-time chief information officer Julie St. John, effective Dec. 31. The mortgage giant announced the news in a recent Securities and Exchange Commission filing in which it said it was eliminating the CIO position. Fannie did not offer another position to St. John. St. John has been playing a pivotal role in the overhaul of Fannie’s enterprise systems. “In order to allow Fannie Mae to obtain St. John’s continued assistance…