The 31-year-old joined TNS from Southport in the summer of 2002 and was first-choice at left back, winning a place in the Welsh Premier's dream teams for seasons 2006/7 and 2007/8. He earned a move to League Two side Accrington Stanley and was a regular for them during his first season, King sustained an injury and was released at the end of 2009, later joining Colwyn Bay during their promotion season.
During his first spell with the Saints, which spanned six seasons, he scored nine goals from 128 (+14) Welsh Premier appearances.
King, who won three league titles while with TNS, also featured in both legs of the Uefa Cup tie with Manchester City in 2003 and the Champions League clash with Liverpool two years later.
Conwy manager Chris Herbert explained that he will add much experience to a young Conwy side: “I'm delighted that we have gained the services of Chris, he is exactly what we have been looking for since the start of the season and adds bags of experience. He is still a top player, only 2 years ago he was playing in the football league for Accrington Stanley and I'm sure he will be a hit at Conwy Borough.”