CRIPPLE CREEK, Colo. -- A former Forest Service worker pleaded guilty Monday to a state arson charge stemming from her involvement in Colorado's largest wildfire. She had already pleaded guilty to two federal charges for starting the massive Hayman Fire.

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Reaction To The Barton Plea

Terry Barton appeared in Teller County court in Cripple Creek, Colo., to face the charge of fourth-degree arson for the 133 homes and one business burned in the blaze.

In court on Monday, she was composed as she walked into court with her two public defenders, 7NEWS reported. However, when the judge asked her if she was in a "culpable mental state" when the fire started, she broke down in tears and responded, "Yes, judge. I am guilty."

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She will be sentenced on March 5.

Because of aggravating circumstances due to the massive amount of damage and destruction, Barton could face up to 12 years in prison, 7NEWS reported.

Barton is already facing six years in federal prison after she plead guilty last month to setting fire to federal forest land and lying to investigators. Her federal sentencing is scheduled for Feb. 21.

The Hayman Fire burned 137,000 acres and cost $39 million to fight. It burned in four counties including Jefferson, Douglas, Park and Teller counties. Long-term restoration of the area burned by the fire could top $150 million, according to the U.S. Forest Service.

Barton, 38, had been charged with four federal felonies and had faced 17 to 65 years in prison, but reached a plea agreement with federal prosecutors.

Barton told federal investigators that she accidentally started the June 8 fire while burning a letter from her estranged husband in a fire ring. She said she tried to put the fire out but it grew out of control because of the tinder-dry conditions exacerbated by the drought. Authorities believed she started the fire deliberately.

Barton, whose job included spotting illegal fires, was fired after she was arrested.

Prosecutors in the four counties filed the state charge in Teller because it had the largest number of evacuees and suffered $13 million in property damage.