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VACAVILLE — Police in Vacaville say a man stole a lottery scratcher worth $10 million from his roommate.

The ticket was purchased at the Lucky grocery store on Dec. 20. Police say the man said he bought the $30 ticket in the hope of winning some extra cash for the holidays.

The man won and thought at first that the ticket was worth $10,000, according to police. He then told his two roommates.

Investigators say the man went to collect his winnings the next day and was told he was not a winner.

“And we had a discussion with him because he said, ‘No, I won. I saw I won $10,000 in this game.’ And he kind of told me some stuff,” said Russ Lopez with the California Lottery.

Turns out, according to Vacaville police, the man’s ticket was not his ticket.

But the next day the real ticket surfaced when his roommate tried to turn in the winner. That’s also when the roommate and suspect learned the scratcher wasn’t a $10,000 winner and instead was a $10 million winner.

According to police, Vacaville detectives and the California Lottery investigator learned one of the man’s roommates went to the same Lucky store, purchased a similar ticket, altered it and swapped it with the winning ticket.

“One of his roommates goes to the same store, purchases the same ticket,” said Chris Polen with the Vacaville Police Department. “Later alters his losing ticket to match the winning ticket.”

The roommate, who police identified as 35-year-old Adul Saosongyang, went to collect his winnings on Monday in Sacramento but was instead greeted by Vacaville police officers.

Saosongyang was booked into jail on suspicion of grand theft.