His first term was marked by SEDCO 's involvement in the largest oil blowout in history , the Ixtoc I oil spill , which caused extensive environmental damage . Clements faced heavily Democratic state legislatures during his tenure . In 1979 , the legislature overrode one of his vetoes , the last time that Texas lawmakers have completed an override . In 1980 , Clements commuted the death sentence of Randall Dale Adams to life in prison . Adams , the subject of '' The Thin Blue Line '' , an Errol Morris documentary film , was exonerated in 1989 after serving twelve years in prison . Clements was also governor at the time of the execution of Carlos DeLuna , who was put to death in 1989 ; evidence questioning the findings of facts that underlay DeLuna 's conviction was published in 2012
Ixtoc I oil spill
Ixtoc I oil spill
Bill Clements