He played for the Parramatta Eels, Manly Warringah Sea Eagles, where he won the 2011 NRL Grand Final, the Canterbury-Bankstown Bulldogs and the Cronulla-Sutherland Sharks in the National Rugby League.

Williams started the 2008 season playing in the Parramatta Eels NYC team and signed with Manly-Warringah Sea Eagles on 27 May 2008, a week before making his NRL debut.

[9] In Round 11 against the Gold Coast Titans, Williams scored his first club try for the Sea Eagles in the 18–17 loss at Cbus Super Stadium.

Williams was selected to play for the Prime Minister's XIII against Papua New Guinea on the wing in the 30–18 win in Port Moresby.

When he returned to the side, Manly coach Des Hasler permanently moved Williams from the wing to the second-row and his form blossomed.

[25][26] Williams finished the 2012 NRL season with him played in 16 matches and scoring 4 tries in his final year with the Manly-Warringah Sea Eagles.

Williams was selected for Australia in the October Trans-Tasman test against New Zealand, playing off the interchange bench in the 18–10 win at 1300SMILES Stadium.

[30] In Round 20 against the Parramatta Eels, Williams played his 100th NRL career match in the Bulldogs 40–12 win at ANZ Stadium.

[43] In Round 5 against the Canberra Raiders, Williams played his 150th NRL career match in the Bulldogs 22–8 loss at Belmore Sports Ground.

Williams' Mate Ma'a Tonga team took on Samoa in the 2016 Polynesian Cup, where he played in the second row in the 18–6 loss at Parramatta Stadium.

On 7 May 2017, Williams played for Tonga against Fiji in the 2017 Pacific Test, starting at second-row but unfortunately suffered a season-ending anterior cruciate ligament (ACL) knee injury during the 26–24 thrilling win at Campbelltown Stadium.

[50] On 14 February 2018, Williams was fined $1,000, had his driver's licence suspended for 12 months, and was placed on a 12-month good behaviour bond after appearing in Parramatta local court for mid-range drink driving.

Williams had insisted on driving home when his wife came to pick him up after a birthday celebration at the Albion Hotel in Parramatta on 16 December 2016.

His driving was so erratic that members of the public called the police, who discovered Williams had a blood alcohol level of 0.122.

[52] On 29 April 2018, Williams ruptured his ACL in Parramatta's 24–22 victory over The Wests Tigers, subsequent scans revealed that he would miss the remainder of the season.

[54] On 25 September, Williams contract with Parramatta was terminated after the player had been found guilty of failing a second drugs test.

Before I let this be just want to congratulate the victim and the so called justice system you’ve sent an innocent brotherly to jail away from he’s kids you bunch of flops … that’s all respectively.