Transcript for Mystery lottery winner puts Novi, Michigan, on the map
Where America's waiting to see the nation's newest billionaire, a lottery winner who may be a little camera shy right now, understandably, but that could change at any minute and ABC's elwyn Lopez is in Novi, Michigan, where the winning lottery ticket was sold. Good morning to you. Reporter: Good morning, Dan. The billion-dollar mystery here in Michigan. In Novi, Michigan. The winner got his or her ticket here at the Kroger and people here tell me that person put this city on the map. And tonight's winning numbers -- Reporter: This morning, a mega mystery in this suburb outside of Detroit. Who's the winner of the mega millions jackpot? So ecstatic that it was somebody in our area. We could have been right there. Reporter: The lucky winner beating the odds of less than 1 in 300 million. Their dreams coming true after buying a ticket at this grocery store here in Novi. Tell me why it's so important for Novi? I think just in general, in any city, saying having that ticket bought means more hustle and bustle into my city. Reporter: After four months without a mega millions winner, the jackpot growing to its third largest in U.S. History. Here in Michigan, the big winner won't remain a mystery forever. They don't have the option to remain anonymous. Reporter: The lump sum cash they do have their make their identity known. Reporter: The lump sum cash option more than $740 million. Neighbors in this city of 60,000 people hoping that some of that will go back into their community. Hopefully they'll be ready to help some people in the area. We just had it hard. Reporter: And guys, that mystery winner could come
This transcript has been automatically generated and may not be 100% accurate.