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A delivery truck driver unaware for weeks he was a new multi-millionaire has come forward as the second winner of a huge Mega Millions jackpot, California Lottery officials said.

Steve Tran of Northern California will split last month's $648 million jackpot — the second largest in U.S. history — with a Georgia woman who already claimed her share.

If he chooses a one-time payment, Tran will pocket $173.8 million before taxes. Tran purchased his ticket at Jenny's Gift Shop in San Jose, then watched as a mad scramble ensued to find the owner of the winning ticket, oblivious to the fact that he was the lucky one.

"Everybody was anxious, looking for the person," Tran said, according to a news release from the California Lottery. Lottery officials did not release Tran's age or city of residence Friday.

According to the news release, Tran said he added the winning ticket to a pile of other lottery tickets he had purchased in other towns on his delivery route. The pile wound up, "just sitting in my house, on top of my drawer,'" the release quoted Tran as saying.

Tran's family then went on vacation without checking the tickets.Tran told lottery officials after he returned from vacation, he "woke up in the middle of the night" and remembered: "I think I went to San Jose."

At 3 a.m. Monday, he checked his tickets and found the winner.

He told lottery officials he gave his wife a smile and a hug, and then called his boss.

Tran said he phoned his boss and left a message that went something like this: "I'm really sorry boss. I hit the jackpot. I don't think I'm going to come in today, tomorrow, or ever."

Related: One winner collects prize, the other remains unknown