A federal jury in New Haven found the former chairman of the Mashantucket Pequot nation guilty of embezzlement on Wednesday.
Michael Thomas, 45, was convicted of charging more than $100,000 in unauthorized personal expenses to the tribe.
"These fraudulent expenses continued even after they were discovered and he was told to stop," said Deirdre Daly, Acting U.S. Attorney from the District of Connecticut.
According to prosecutors, between October 2007 and April 2009, Thomas used a credit card issued to him by the Mashantucket Pequot Tribal Nation to pay for satellite TV service, satellite radio service, computers and to pay for a car service to transport his mother to and from kidney dialysis treatments.
The charges were personal and not for official tribal business, prosecutors said.
The Mashantucket Pequot Tribal Nation runs the Foxwoods Resort and Casino on its reservation in southeastern Connecticut.
Thomas faces a maximum of 25 years in prison and a $750,000 fine when he is sentenced on Oct. 22.