Unfortunately for Cynthia Keegan, dead men do tell tales.

Keegan, 51, owns a van company that provided nonemergency rides for wheelchair-bound MassHealth patients. Some of the patients she billed MassHealth for, it turned out, had not used the service. Because they were dead.

In September, Keegan was indicted on seven counts of larceny and seven counts of making false claims to Medicaid for billing MassHealth for nearly 10,000 rides that never happened, using the names of a dozen nursing home patients and 47 people who had previously ceased to be. Those rides never actually happened because Keegan’s Cross Roads Trolley is a wheelchair van company, not a hearse company.

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The business owner, who lives in Webster, initially pleaded not guilty in October but changed her plea today, Attorney General Martha Coakley announced.

“The owner of this company intentionally stole thousands of dollars from taxpayers by billing for rides that never occurred, or for people who were deceased,” Coakley said in a statement. “This coverage is meant to provide transportation services for residents who need outpatient medical care, and we cannot tolerate those who take advantage of MassHealth.”

Keegan obtained more than $400,000 for her claims on the living patients, but most of her claims on the non-living were rejected.

She will be sentenced on August 21.

Boston.com called a phone number listed for Cross Roads Trolley for comment, but, like many of Keegan’s patients, it was no longer in service.