The Newcastle Knights have released fullback Darius Boyd from the final year of his contract, and signed St George Illawarra Dragons prop, Jack Stockwell to a three-year deal.

The club has also renewed the contracts of forwards David Fa’alogo and Chris Houston.

Boyd,27, played 62 games for the Knights after following head coach Wayne Bennett from the Brisbane Broncos to the St George Illawarra Dragons in 2008, and then from the Dragons to the Knights in 2012.

He admitted himself into a mental health clinic to treat depression in July 2014, and took no further part in the Knights’ season.

Stockwell, 22 played 35 games for the Dragons since making his debut in 2012. He represented NSW at under 20’s level in 2012 and was contracted to the Dragons until 2017 but was released from his contract.

The 34-year old Fa’alogo made his NRL debut in 2003 for the South Sydney Rabbitohs, playing 142 games for the club over 7 seasons before a 3-season stint with the Huddersfield Giants in the European Super League between 2010-2012. He returned to Australia to play for the Knights in 2013 and has played 40 games for the club so far. He has also played 12 Tests for New Zealand and 6 Tests for Samoa.

Houston,29, has played 158 NRL games since his debut for the Dragons in 2007. After just one season and 16 games for the club he moved to the Knights in 2008 and has played 138 games.