Dio Maddin

On September 10, 2019, Maddin joined the commentary team for 205 Live, replacing Nigel McGuinness. Later that same month, WWE announced as part of their "Premiere Week" that the commentary teams would be changed, with Maddin becoming an analyst for the Raw commentary team with Vic Joseph and Jerry Lawler.

On the November 4, 2019 edition of Monday Night Raw, Maddin was attacked by Brock Lesnar who performed an F5 on Maddin through the announcer's table. Maddin was defending fellow commentator Jerry Lawler after being threatened by Lesnar's advocate, Paul Heyman. He would then leave the announce team and go back to NXT to pursue a return to the ring, being replaced by Samoa Joe.

He made his debut with Reality of Wrestling on February 1, 2016, under the ring name of Marcellus Black.

On February 11, 2016, Williams participated in a WWE try-out at the WWE Performance Center in Orlando, Florida. On August 1, 2016, WWE officially announced the signing of Williams, who started training at the Performance Center the same day.

He made his in-ring debut for the company at a NXT live event in Orlando, Florida on September 30, 2016, competing in a battle royal. In June 2019, Brennan was given the new ring name, Dio Maddin.

He has also voice acted in various videos, such as "Jojo's Bizarre Adventure Part 2 - Did You Know Anime?" by Did You Know Anime, and "Welcome to YouTube Comments (2016) - Part 1" by JelloApocalypse.

On February 20, 2015, Williams was signed by the Jacksonville Jaguars, to a two-year contract, with the intention of being a back up to starter Jeremy Parnell. On August 29, 2015, Williams was released by Jacksonville.

On October 20, 2015, the New England Patriots signed Williams to their practice squad. They waived him two days later.

After being released by the Patriots, Williams returned to Houston to train to become a professional wrestler. On October 27, 2015, it was announced that Williams was being trained by WWE star Booker T to become a professional wrestler.

On February 15, 2014, Williams's number 73 was retired by Catholic Memorial.

The Houston Texans selected Williams in the third round with the 89th overall pick of the 2013 NFL Draft. He would go on to miss his rookie season with a microfracture in his knee. On July 21, 2014, he was released.

Prior to beginning his professional wrestling career, Williams was drafted by the Houston Texans of the National Football League in the third round (89th overall) of the 2013 NFL Draft. He played college football at North Carolina.

Williams received an athletic scholarship to attend the University of North Carolina at Chapel Hill, where he played for the North Carolina Tar Heels football team from 2009 to 2012. As a senior in 2012, he received honorable mention All-Atlantic Coast Conference (ACC) honors. Williams tore his labrum his senior year of college. Williams majored in communications while attending North Carolina.

While at Catholic Memorial, Williams was a member of PrepStar' s High School All-America team, a member of the "Super 26" team in 2008, an all-scholastic by the Boston Globe and Boston Herald. He was named all-conference as both a junior and senior. He was rated as the eight best offensive lineman in the country by SuperPrep All-America. Rivals.com rated him the seventh best offensive guard in the country. Scout.com rated him as the 15th best offensive lineman in the country. ESPN.com rated him the 35th best offensive tackle in the country. He was also a member of the Rivals 250. He also played in the U.S. Army All-American Bowl.

Brennan Marcel Williams (born February 5, 1991) is an American professional wrestler, professional wrestling commentator, and former American football offensive tackle currently signed to WWE, where he performs under the name Dio Maddin. He is a former commentator for WWE's Raw brand and currently performing as a wrestler on the NXT brand. He previously wrestled on the independent circuit under the ring name Marcellus Black.