Kendall Law Group, led by former federal judge Joe Kendall, is investigating Petrohawk Energy Corp. (NYSE: HK) for shareholders in connection with the proposed acquisition by BHP Billiton Ltd. The national securities firm's investigation seeks to determine whether Petrohawk Energy and its Board breached their fiduciary duties by entering into the agreement without properly shopping for a deal that would provide better value for shareholders. If you are a Petrohawk Energy shareholder and would like additional information about your rights, contact the Kendall Law Group at 877-744-3728 or by email at investor@kendalllawgroup.com.

On July 14, 2011, the companies announced the definitive merger agreement under which Petrohawk Energy would be acquired by BHP, in a transaction valued at approximately $12 billion. Under the terms of the agreement, Petrohawk Energy stockholders will receive $38.75 in cash for each share of Petrohawk Energy/HK common stock held. Shares of Petrohawk Energy have risen more than 28 percent this year. According to Thompson/First Call, analysts have set a price target as high as $39.00 per share for Petrohawk Energy's stock. The firm's investigation seeks to determine whether Petrohawk Energy and its Board undertook a fair process in negotiating the deal.

Kendall Law Group was founded by a former federal judge, includes a former United States Attorney, prosecutors and securities lawyers who are experienced in complex securities litigation. The firm has been counsel in numerous merger and acquisition cases nationwide, including some of the largest transactions in the United States.

Kendall Law Group LLP
Scott Kendall, 214-744-3000
877-744-3728 Toll Free
214-744-3015 Facsimile
skendall@kendalllawgroup.com
www.kendalllawgroup.com