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An initial report found an uncontrolled release of gas appeared to be the cause of the Jan. 22 explosion of an Oklahoma drilling rig.

A second wrongful death lawsuit has been filed over a natural gas rig explosion in January near Quinton OK, that killed five workers.

Betty Jo Cunningham of Seminole, Oklahoma, filed the lawsuit Friday. Cunningham is the widow of Roger Cunningham, one of three Oklahoma men killed in the Jan. 22 explosion. The lawsuit names Red Mountain Energy, Red Mountain Operating, Patterson-UTI Drilling and Patterson-UTI Energy.

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The widow of Parker Waldridge, also of Oklahoma, filed a similar lawsuit a week earlier.

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The initial incident report into the explosion indicates there was an uncontrolled release of gas that caught fire and that a worker at the scene tried unsuccessfully to shut down the well.

Patterson-UTI hasn’t responded to a request for comment, but previously said it’s committed to preventing future accidents. An attorney for Red Mountain hasn’t returned a phone request for comment.

The explosion near Quinton, about 100 miles (160 kilometers) southeast of Tulsa, also killed Matt Smith of Oklahoma, Josh Ray of Texas, and Cody Risk of Colorado.

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