Who is the mystery Mega Millions winner? NBC correspondent Kerry Sanders talks to Andrea Mitchell in this video about the drawing for the second largest lottery jackpot in history.

The sole ticket matching all six numbers for the July 29 drawing was sold at a Chicago suburb Speedway gas station.

What should you do if you’re the Mega Millions billion-dollar winner? Advice from Wells Fargo expert Emily Irwin. VIDEO: NBC

“The winner has 12 months from the date of the drawing to claim their prize but only 60 days between the drawing to choose between the cash option or annual payments,” says Sanders.

He said, “Most winners opt for the cash option, which is an estimated $780 million. So far no one's come forward to publicly claim the prize.”

VIDEO: MSNBC