When the WWE ended its relationship with DSW in the spring of 2007, Miller was one of over twenty developmental wrestlers to be sent for further training at the new Florida Championship Wrestling (FCW) territory.

Miller and Lewington defeated Brandon Groom and Greg Jackson and The Thoroughbreds (Johnny Curtis and Kevin Kiley) to reach the finals.

[9][11] On February 16, 2010, Miller, now using the ring name Heath Slater, was one of eight FCW wrestlers to compete on the first season of the new NXT show, with Christian as his storyline mentor.

On the inaugural episode of NXT, Slater debuted as a face as he and Christian defeated Carlito and Michael Tarver in a tag team match.

On the June 7 episode of Raw, Slater and the other season one NXT rookies established themselves as heels by interfering in the main event match between John Cena and CM Punk, attacking both competitors, Jerry Lawler and Justin Roberts before dismantling the ring area and surrounding equipment.

The following week on Raw, Vince McMahon fired Hart and installed the Anonymous General Manager, who signed the seven season one NXT rookies to contracts.

[20][21] Gabriel and Slater held the title for nearly two months, before losing it to Santino Marella and Vladimir Kozlov in a four-way elimination match also involving The Usos and Mark Henry and Yoshi Tatsu on the December 6 episode of Raw.

[22] Gabriel and Slater received a championship rematch at TLC: Tables, Ladders & Chairs but lost by disqualification when Nexus member Michael McGillicutty interfered.

[23] On the January 10, 2011, episode of Raw, Gabriel and Slater refused to take part in new Nexus leader CM Punk's initiation and walked away from the group.

[24] The following day, at the January 11 taping of SmackDown, Gabriel and Slater helped their former leader Wade Barrett and Ezekiel Jackson attack Big Show.

[29][30] They received a rematch at the Elimination Chamber pay-per-view on February 20 and defeated Marella and Kozlov to win the WWE Tag Team Championship for the second time.

In the segments, Slater would enter the ring and issue challenges to "the so-called legends" or "any former WWE champion", which resulted in him losing a series of squash matches, with the first two losses to Vader and Sycho Sid.

Over the next couple months, the group continued being used as part-timers but mostly as jobbers, while doing that on the main brand TV shows they would feud with Zack Ryder on Superstars.

On the November 11, 2013, edition of Raw, while on tour in the UK, 3MB changed their name to The Union Jacks, but were defeated by Santino Marella and Los Matadores.

[46] On the June 16, 2014, edition of Raw, Slater showed signs of a face turn as he stood up to Rusev and Lana by responding to their anti-American promos.

On the February 16, 2015, episode of Raw, O'Neil made a face turn and reformed the Prime Time Players with Darren Young, effectively disbanding Slater Gator.

Slater started appearing on Raw, trying to answer John Cena's United States Championship Open Challenge, but was denied each week.

On the January 4, 2016 Raw, Slater debuted a new stable of himself, Curtis Axel, Adam Rose and Bo Dallas calling themselves "social outcasts".

[50] On the January 14 episode of SmackDown, the four defeated the team of Goldust, Damien Sandow, Jack Swagger and Zack Ryder in an eight-man tag match.

[55] Slater appeared on the July 26 episode of SmackDown, cutting a highly acclaimed worked shoot promo addressing the issue,[54][56] only to be attacked by a returning Rhyno shortly after.

[58][59] Despite not appearing at the event, WWE audiences chanted "we want Slater" during the brawl between Roman Reigns and Rusev at SummerSlam,[60][61] as well as the following night on Raw.

[77] On the December 3 episode of Raw, acting general manager Baron Corbin forced Slater and Rhyno to fight each other with the stipulation that the loser will be fired.

Corbin begged to be the permanent Raw general manager, but the family announced that he would have to win a no disqualification handicap match against Angle, Crews, Roode, and Gable with Slater as referee, which he lost.

[95] On the August 4 episode of Impact!, Heath made his in-ring debut by challenging Moose for the TNA World Heavyweight Championship and a spot on the roster, but was defeated.

[96] Despite this, he and Rhino began a "#Heath4IMPACT" campaign to convince the company to sign Heath, even getting celebrity endorsements from David Hasselhoff, Flava Flav, Nancy Kerrigan and Chuck Norris.

[97][98] At Victory Road, Heath and Rhino teamed for the first time in Impact, where they defeated Reno Scum (Adam Thornstowe and Luster the Legend).

At Against All Odds, Heath, America's Most Wanted (Chris Harris and James Storm), and The Good Brothers (Doc Gallows and Karl Anderson) defeated Honor No More (Eddie Edwards, Kenny King, Matt Taven, Mike Bennett, and PCO) in a ten man tag team match.

At Victory Road, Heath, Josh Alexander, and Rich Swann lost to Honor No More (Eddie Edwards, Matt Taven, and Mike Bennett).

On the December 15 episode of Impact Wrestling, Heath and Rhino lost the tag team championship to The Motor City Machine Guns.

[112] After being released by WWE and while working for Impact, Slater debuted at Lariato Pro Wrestling on September 12, 2020, in Dublin, Georgia defeating Jay Bradley.