Cleveland Browns coach Eric Mangini's trusted confidante Erin O'Brien has been fired, according to the Cleveland Plain Dealer.

It's a negative sign for Mangini's clout and job security.

O'Brien, who came with Mangini from the New York Jets, was in charge of travel arrangements, but botched the transportation for the team's medical workers.

According to the Browns, O'Brien officially resigned for "personal reasons."

However, she apparently had "burned so many bridges" her job was unsavable.

A potential target for Browns owner Randy Lerner is former Pittsburgh Steelers coach Bill Cowher.

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