[cnn-photo-caption image=http://i2.cdn.turner.com/cnn/2009/CRIME/10/11/texas.execution.probe/art.willingham.family.jpg caption="A family photo shows Cameron Todd Willingham with his wife, Stacy, and daughters Kameron, Amber and Karmon."]
Texas Gov. Rick Perry has removed a fourth member of a state commission charged with investigating claims that an innocent man may have been executed, his office said.
The Texas governor has now replaced all of the four members that, under law, he is allowed to appoint to the commission. The remaining five members are appointed by the state's lieutenant governor and attorney general.
Perry's critics say his actions are politically motivated, a charge he denies.
The investigation into claims that faulty evidence led Texas to execute an innocent man in 2004 was at a "crucial point" when the shakeup occurred, one of the replaced members said.
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