Overview
- Williams, who posted the news Wednesday on social media, ended his club career two months after stepping away from Wales.
- He said knee trouble over recent years left him unable to keep playing at the level he expects.
- Newcastle Red Bulls said injuries kept him to three appearances this season and praised his leadership off the field.
- Across his international career he earned 93 Wales caps and 21 tries, won two Six Nations titles including the 2019 Grand Slam, and played five Tests for the British and Irish Lions.
- His club path ran from Scarlets to Saracens, Cardiff and Japan's Kubota Spears before a short spell at Newcastle, capping a rise that began while he worked as a scaffolder in Port Talbot.