A McDonald's worker who claims to have a winning ticket for the world's biggest lottery prize said she will not share her millions with the colleagues with whom she was in a syndicate.

Mirlande Wilson, a 37-year-old Haitian immigrant, said she purchased the ticket, now worth more than $US100 million, with her own money separately from those bought for the 14-strong syndicate at the fast food restaurant in Milford Mill, Maryland. Her irate co-workers, who earn around $US7 an hour, say that they each contributed $5 before sending her out to buy tickets for the group a few hours before Friday's Mega Millions draw, and are demanding she splits the prize.

Stephen Martino, director of the Maryland Lottery, speaks to reporters outside a Baltimore 7-11 store where one of the winning lottery tickets was sold. Credit:AP

The boyfriend of a manager at the McDonald's said he told Miss Wilson: "These people are going to kill you. It's not worth your life."

CCTV footage shows that the winning ticket was bought from a nearby grocery store at 7.15pm - around the time the McDonald's workers agree Miss Wilson went to the shop. In a phone call to the restaurant shortly after the numbers were announced at 11pm, Miss Wilson is said to have shouted: "I won, I won."