The director of the Maryland Lottery says no one in the state has stepped forward with a winning Mega Millions lottery ticket yet. But a McDonald's employee in Maryland says she has the winning ticket.

Stephen Martino said Monday on NBC's "Today" show that the ticket, one of three winning tickets purchased for the record-breaking $640 million prize, has yet to be claimed. The ticket was purchased at a 7-11 in Baltimore County.

The New York Post reported Monday that McDonald's employee Mirlande Wilson claims she holds the winning ticket. The newspaper reports that Wilson plans to contact lottery officials Monday.

Controversy surrounds her story as she claims to be the sole ticket holder. He co-workers, however, say she bought it as part of a pool.

The other two were sold in Illinois and Kansas.

The Associated Press contributed to this report