They said the ticket purchased at a Clark service station in New Berlin for the Sept. 3 drawing had been presented by Dennis Poppe.
The ticket with the numbers four, six, 17, 25, 42 and 48 had been a "quick pick" selection with the numbers generated by computer rather than picked by the purchaser.
The jackpot was the 50th since the Wisconsin Megabucks game began in 1992, and the first since Suzie Kanarowski of Mauston won $4.2 million in June 7 drawing.
The Clark station earned a $68,000 commission for selling the winning ticket, representing 2 percent of the prize.
Poppe, his wife Nancy and Clark representatives scheduled a news conference Friday at the service station to discuss winning the jackpot.
Over three months to reach $3.4 million? Sounds like WI should join neighboring Iowa and Minnesota in Hot Lotto...