TV-RADIOXavier Prather is first Black 'Big Brother' winner in the show's 21-year history, part of historic Cookout alliance Christopher KuhagenNow News GroupXavier Prather, a Milwaukee attorney, was crowned the winner of the 23rd season of "Big Brother," winning the grand prize of $750,000 on Sept 29, 2021. Prather, who grew up in Michigan, celebrated with his family afterward.CBS Broadcasting, Inc."Big Brother" winner Xavier Prather hugs Azah Awasum, who finished in third place, in the CBS reality-competition series that concluded its season on Sept. 29, 2021.CBS Broadcasting, Inc."Big Brother" host Julie Chen Moonves reveals that Xavier Prather won the 23rd season of the CBS reality-competition show on Sept. 29, 2021. Prather received all nine of the jury's votes over Derek Frazier, son of the legendary boxer Joe Frazier.CBS Broadcasting, Inc.Xavier Prather and Azah Awasum compete in part 3 of the Head of Household competition during the live season finale of "Big Brother" on Sept. 29, 2021. Prather answered all eight of the questions correctly. Awasum answered seven correctly. Prather then voted her out.CBS Broadcasting, Inc.Xavier Prather prays that he has the answer correct in the part 3 of the final Head of Household competition during the season finale of "Big Brother" on Sept. 29, 2021. He won the competition and won "Big Brother" about an hour later.CBS Broadcasting, Inc.Xavier Prather's calm demeanor made him well-liked by all of the houseguests on "Big Brother." He advanced to the final two where the jury awarded him the $750,000 grand prize on Sept. 29, 2021.CBS Broadcasting, Inc.Xaver Prather, a Milwaukee attorney, won season 23 of "Big Brother."CBS Broadcasting, Inc.Head of Household Xavier Prather won the final veto competition of the summer on "Big Brother." The episode aired on Sept. 22, 2021. He would keep his nominations the same to ensure his biggest threat, Kyland Young, was voted out on Sept. 23. Prather won the last two HOH competitions and two of the final four veto competitions on his way to winning the game.CBS Broadcasting, Inc.The final three houseguests, from left, Xavier Prather, Derek Frazier and Azah Awasum, on the 23rd season of "Big Brother" share a glass of Champagne to celebrate their accomplishment on Thursday, Sept. 23, 2021. Prather won the final four Head of Household to ensure he would advance to the final three.CBS Broadcasting, Inc.Xavier Prather and Derek Frazier, son of legendary boxer Joe Frazier, formed a final two on Day 1. The two advanced to the end, but Prather received all nine of the jury votes to win "Big Brother."CBS Broadcasting, Inc.The final six houseguests - all members of the dominant Cookout alliance - pose in their Comics apparel for this always popular "Big Brother" veto competition, an episode that aired Wednesday, Sept. 15, 2021. The Cookout featured, back row, from left, Kyland Young, Derek Frazier and Xavier Prather; middle row, from left, Hannah Chaddha and Tiffany Mitchell; front row, Azah Awasum.CBS Broadcasting, Inc.Xavier Prather won the golden power of veto during a double eviction episode on Sept. 9, 2021, and would take himself off the nomination block. It was Prather's second of three veto competitions he would win on the season.CBS Broadcasting, Inc.The final six houseguests hug after accomplishing their goal of ensuring a Black man or woman would win "Big Brother" for the first time in the show's history. That person would be Xavier Prather, a Milwaukee attorney. He won by a unanimous vote, 9-0, on Sept. 29, 2021.CBS Broadcasting, Inc.Xavier Prather, left, and Alyssa Lopez were nominated during the double eviction on Sept. 9, 2021. Though Lopez wasn't in Prather's Cookout alliance, they were close and were part of the Kings team earlier in the season. Prather survived the night. Lopez did not.CBS Broadcasting, Inc.Xavier Prather began a double eviction episode on Sept. 9, 2021, on the nomination block. With his Cookout alliance behind him, Claire Rehfuss went home.CBS Broadcasting, Inc.Xavier Prather celebrates with his fellow Cookout members toward the latter stages of the season. The alliance advanced to the final six.CBS Broadcasting, Inc.Xavier Prather was one of four "Big Brother" houseguests sharing a fun moment after a veto competition in an episode that aired Sept. 1, 2021. Hannah Chaddha won the competition and as a reward invited the three houseguests on the nomination block, to watch a movie in the Head of Household room.CBS Broadcasting, Inc.Week 3 Head of Household Xavier Prather nominates two houseguests for eviction in an episode that aired on July 25, 2021. The target Brent Champagne went home. Prather wanted to minimize his threat level by throwing competitions early on, but he also said being in power one week at the beginning of the season helped him gain trust with his fellow houseguests.CBS Broadcasting, Inc.Xavier Prather tries to complete a Plexiglass puzzle in a competition on the season premiere of "Big Brother" on July 7, 2021. Prather, a Milwaukee attorney, is one of 16 houseguests on the CBS reality-competition show.CBSMilwaukee attorney Xavier Prather is one of the 16 houseguests in Season 23 of "Big Brother." The CBS reality-competition series began its latest season July 7, 2021.Cliff Lipson/CBS