IOWA CITY, Iowa (AP) — Investigators say they’ve uncovered how a lottery employee allegedly rigged jackpots and have charged his brother in connection with prizes in Oklahoma and Colorado.

Tommy Tipton, a former justice of the peace in Texas, surrendered to Iowa authorities on Wednesday. He’s the brother of Eddie Tipton, who was convicted of fixing a $16.5 million jackpot and faces charges related to other jackpots.

Prosecutors allege that he used his access to random number generators to fix jackpots in Kansas, Colorado, Wisconsin and Oklahoma and worked with associates to play winning numbers and collect prizes.

Authorities said Wednesday they’ve recovered the generator used for a $2 million jackpot claimed by Eddie Tipton’s friend. An examination found that code allowed numbers to be picked by a different program three days of the year.

All six jackpots linked to Tipton were drawn on either Nov. 23 or Dec. 29.