<p>HOUSTON - A former Enron Corp. executive who once embarked on expanding capability of messaging software to run the company's nationwide telecommunications network surrendered to the FBI Wednesday on charges of fraud, money laundering, insider trading and conspiracy.</p>
<p>Rex T. Shelby, 51, was among five former Enron Broadband executives indicted last week for allegedly scheming to promote the network as having capabilities it didn't have and selling millions of dollars in stock.</p>